PART_LIST p2 ON (CONVERT(nvarchar(10),e.status,0)) = p2.PART, Type conversion in expression (CONVERT(nvarchar(10),[e]. Asking for help, clarification, or responding to other answers. Should I give a brutally honest feedback on course evaluations? Referral source is a varchar(50) column in both staging tables and this query is being used in SSIS dataflow to load up new values into MDS. Refer this link Example 3.1 & Eample 3.2 - [dbo]. Take a look at this. table. For further investigation, we would need to see the query plans, both from SQL 2008 and SQL 2014. [STATUS],0)) may affect "CardinalityEstimate" in query plan choice e.status = varchar (10) p2.part = nvarchar (100) Please, assist. Large scale of database and data cleansing Please support me on Patreon: https://www.patreon.com/roelvande. convert character_expression. This would resolve your issue. LEFT ( character_expression , integer_expression ). Is there any way I can get rid of this warning? How did muzzle-loaded rifled artillery solve the problems of the hand-held rifle? How to show first row group by part id and compliance type based on priorities of Document type? Still looking for an elegant work-around :). But that was related to collation and not with computed columns. How can I use a VPN to access a Russian website that is banned in the EU? Hope this helps. I assume that for the CardinalityEstimate warning, if the type conversion is used to filter the results somehow, then that . SQL Server routinely expands computed columns (persisted or not) into the underlying definition at the start of the compilation process. Stack Exchange network consists of 181 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. Is such a complex filter confusing the optimizer? Each table under the view stores one month of data. Welcome to Microsoft Q&A!Please see this MS Doc about Cardinality Estimation. Sed based on 2 words, then replace whole line with variable. Type conversion in expression may affect "CardinalityEstimate" in query plan choice? you have data in PART_LIST.part column that is more than 10 characters in length. Are defenders behind an arrow slit attackable? Should teachers encourage good students to help weaker ones? http://sathyadb.blogspot.in/2012/08/sql-server-various-observations-on.html, Data type precedence chart - Is there an index on that column that the plan is not using? http://msdn.microsoft.com/en-us/library/ms190309.aspx. This is very much expected behavior if you have different datatypes to join together. Type conversion in expression (CONVERT_IMPLICIT (nvarchar (10), [e]. This is actually expected. Regards, It is assumed that you have varchar datatype assigned for PART column. Every plan that uses type conversions, either implicit or explicit, will show that warning. dateadd in the where clause - how can I avoid a full scan in this particular situation? ,112)) may affect "CardinalityEstimate" in query plan choice. Connect and share knowledge within a single location that is structured and easy to search. SQLCoffee.com. Points: 882 More actions November 30, 2018 at 2:59 am #416524 Hello, All! convert(nvarchar(50), Help us identify new roles for community members, Performance Improvement went wrong in Production, worked fine in Test. Again, I would go with changing the datatype if possible. [UserData] union select [ReferralSource] from [PlatformDM_Stage1]. In many cases, this is for the better, but there are also situations where it can cause plan regressions, and this is what you may be seeing. Ready to optimize your JavaScript with Rust? Warning is not showing on SQL 2008, because it was not implemented in that release. It's that simple. Browse other questions tagged, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site, Learn more about Stack Overflow the company. column data type VARCHAR of lower precedence has been converted todata type NVARCHAR of higher precedence . If you have extra questions about this answer, please click "Comment". Without the query plan, it is impossible to guess why it is slow. The best thing is to change your table structure. Databases: What Triggers This Warning: Type Conversion in Expression May Affect "CardinalityEstimate" in Query Plan ChoiceHelpful? Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. (And I take for granted that you are on SQL 2014 SP3 CU4. Asking for help, clarification, or responding to other answers. I can't quite understand why does this warning come up, since cardinality should have been determined way before the last Compute Scalar step. Why am I getting an implicit conversion of Int / Smallint to Varchar, and is it really impacting Cardinality Estimates? Type conversion in expression try_cast may affect cardinality estimate in query plan choice, UNION ALL implicit conversion for VARCHAR(MAX) column. [SessionData] ) select CampaignKey = convert (nvarchar (50), [ReferralSource]) Hello, What I mean is that is just a warning. Connecting three parallel LED strips to the same power supply. Both statements should be performing LEFT() on int type so I don't understand why one returns a warning and the other doesn't. Hope this helps. A warning message tells you that the query execution engine cannot optimize a query plan that uses a column of one type as though it were a column of a different type. Type conversion in expression try_cast may affect "CardinalityEstimate" in query plan choice . And there is a warning in the plan regarding TRY_CAST.. there is no more any warnings, the query plan is here. But that was related to collation and not with computed columns. Type conversion in expression may affect "CardinalityEstimate" in query plan choice?Helpful? Type conversion in expression may affect "CardinalityEstimate" in query plan choice? character_expression can be of any Is it appropriate to ignore emails from a student asking obvious questions? What Triggers This Warning: Type Conversion in Expression May Affect "CardinalityEstimate" in Query Plan Choice. Connect and share knowledge within a single location that is structured and easy to search. This forum has migrated to Microsoft Q&A. rev2022.12.9.43105. Help us identify new roles for community members. bit columns generating warnings - how can a cast in the field list affect the cardinality estimate? Disconnect vertical tab connector from PCB. I have the following table definitions that are used in a query below that is giving me a query hint, Type conversion in expression Scans. When I remove the MIN and MAX columns from the select, there is no more any warnings. [STATUS],0)) may affect "CardinalityEstimate" in query plan choice e.status = varchar (10) p2.part = nvarchar (100) Please, assist. LEFT OUTER JOIN PART_LIST p2 ON e.status = p2.PART AND p2.PART_TYPE = 'ABC' Type conversion in expression (CONVERT_IMPLICIT (nvarchar (10), [e]. = 'ABC' --This would filter and move the data to temp table, LEFT OUTER JOIN SQL Server Developer Center. character_expression can Are there conservative socialists in the US? Type conversion in expression (CONVERT(varchar(30),) may affect "CardinalityEstimate" in query plan choice, Type conversion in expression may affect "CardinalityEstimate" in query plan choice, sql-server-general sql-server-transact-sql. "CardinalityEstimate" in query plan choice, Please note the computed column flightReference, When I run the following query I get a warning on the select: That's how the new cardinality estimator behaves. Type conversion in expression (CONVERT(varchar(30),) may affect "CardinalityEstimate" in query plan choice, Type conversion in expression may affect "CardinalityEstimate" in query plan choice. You can upload the plans on http://www.brentozar.com/pastetheplan. To learn more, see our tips on writing great answers. From Microsoft: When an operator combines expressions of different data types, the data type with the lower precedence is first converted to the data type with the higher precedence. If the conversion isn't a supported implicit conversion, an error is returned. Why is the eastern United States green if the wind moves from west to east? Type conversion in expression may affect "CardinalityEstimate" in query plan choice? (CONVERT(varchar(10),[t]. Msg 6355 "Conversion of one or more characters from XML to target collation impossible" when querying sys.dm_exec_query_plan. [SessionData] ) select CampaignKey = convert (nvarchar (50), [ReferralSource]) I have a query that is running very slow so I started looking into the Execution Plan. At what point in the prequels is it revealed that Palpatine is Darth Sidious? Where is it documented? Hello, Improves MS SQL Database Performance It's the same issue. Visit Microsoft Q&A to post new questions. What is the point in that? It's a constant expression being passed into a deterministic function - guaranteed to only return one "row." What does that mean in this context? The warning is informational, to help you understand any issues you might notice with cardinality estimation. Sudo update-grub does not work (single boot Ubuntu 22.04). [STATUS],0)) may affect "CardinalityEstimate" in query plan choice e.status = varchar (10) p2.part = nvarchar. Type conversion in expression (CONVERT(varchar(12),[test]. Here is a small demonstration for the same: First create a sample data: 1 2 3 4 5 6 7 8 9 CREATE TABLE FirstTable (ID INT, Col VARCHAR(100)) GO INSERT INTO FirstTable (ID, Col) SELECT 1, 'First' UNION ALL SELECT 2, 'Second' UNION ALL A big change in SQL 2014 was the introduction of the Cardinality Estimator. Trying to convert a. PART_TYPE To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Please note that I am not a DBA but a coder. If you tried with temp table solution, Can you show me the table structure for Temp table? Type conversion in expression (CONVERT_IMPLICIT(nvarchar(128),[o]. Current Visibility: Visible to the original poster & Microsoft, Viewable by moderators and the original poster, https://www.sqlshack.com/implicit-conversion-in-sql-server. Would it be possible, given current technology, ten years, and an infinite amount of money, to construct a 7,000 foot (2200 meter) aircraft carrier? 5. But that was related to collation and not with computed columns. When the optimizer encounters the expression, it may add a warning to the plan. The best I've been able to come up with is doingconvert(nvarchar(50), [ReferralSource] + '') - but Does a 120cc engine burn 120cc of fuel a minute? Why am I getting an implicit conversion of Int / Smallint to Varchar, and is it really impacting Cardinality Estimates? Alberto Morillo Still the same error. I have the following table definitions that are used in a query below that is giving me a query hint. Ready to optimize your JavaScript with Rust? [STATUS],0)) may affect "CardinalityEstimate" in query plan choice, Hello, There are no computed columns in my example, so that isn't the issue. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. cast(p2.PART as part (10)), Best Regards,Uri Dimant SQL Server MVP, Tried both the methods. Hope this helps. Making statements based on opinion; back them up with references or personal experience. But that still doesn't explain to me why select LEFT(30500600, 2) by itself doesn't cause a warning if I'm passing an int directly to the LEFT() function. Why is apparent power not measured in Watts? What's going on here? Why does conversion - which should be done after the UNION and DISTINCT sort, affect the CardinalityEstimate? Can virent/viret mean "green" in an adjectival sense? Just because the computed column is persisted, does not mean the optimizer will choose to use the persisted value. SQL Server Developer Center. The CE updates for levels 120 and above incorporate updated assumptions and algorithms that work well on modern data warehousing and on OLTP workloads. Getting Type Conversion Error for Select statement. The query plan is here, When I remove the MIN and MAX columns from the select, Browse other questions tagged, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site, Learn more about Stack Overflow the company, I mention that I did that in my first paragraph of my. Stack Exchange network consists of 181 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. [SessionData] ) select CampaignKey = convert (nvarchar (50), [ReferralSource]) [PART],0)) may affect "CardinalityEstimate" in query plan choice, Type conversion in expression ([e].[STATUS]=CONVERT(varchar(10),[p2]. [#MyFunIntTable]. In the second paragraph of my edit above I used CAST to explicitly convert to varchar so I wouldn't think that a conversion would be taking place? Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread. Query to list all the databases that have a specific user, Year and Month aggregation in same Pivot table in SQL Server, SQL Server Query for Searching by word in a string with word breakers. #temp_Tablep2 ON e.status = p2.PART, ON cast(e.status The whole warning seems kind of bogus, I wouldn't make a big deal about it if I didn't have traces that look for the Warnings and raise alerts, which is why I want to write my queries so they don't raise any Warnings My question still stands - is there a more proper way to avoid the warning than doingconvert(nvarchar(50), Is there any reason on passenger airliners not to have a physical lock between throttles? I've made an Minimal, Reproducible Example here: Subsequent updates started with SQL Server 2014 (12.x), meaning compatibility levels 120 and above. Both of them indicate that your query will run slower. I maintain an archive database that stores historical data in partitioned views. I've tried cast to varchar in the original query: LEFT(cast(test.col1 as varchar(12)), 2) which returns the same warning. Getting Type Conversion Error for Select statement. Your query is going for scan because TRY_CAST is a safe way of finding out if the data can be cast to a type. Thanks for contributing an answer to Database Administrators Stack Exchange! You can see here how we can fix this issue by changing the datatype: Simple Explanation of Data Type Precedence. United States (English) If I get the estimated execution plan for that statement, it's just a single "select without query" element: For what it's worth, even the table variable version doesn't display the warning in SQL Server 2017 (because it's really a pointless warning when the conversion can't possibly affect a cardinality estimate - as in your example). Remote DBA Services: data type NVARCHAR of higher precedence . "Type conversion in expression (CONVERT (nvarchar (50), [Union1008],0)) may affect "CardinalityEstimate" in query plan choice" with [ReferralSource] as ( select [ReferralSource] from [PlatformDM_Stage1]. JOIN [UserData] union select [ReferralSource] from [PlatformDM_Stage1]. The Table design can't be modified. SELECT t.FLIGHT#, t.flightReference, PNR_NUMBERS, MIN(td.DEP_DATE_TIME) AS departDate, MAX(td.ARR_DATE_TIME) AS arrivalDate, CASE WHEN PNR_NUMBERS IS NULL OR PNR_NUMBERS = '' THEN 'Paper . Type conversion in expression may affect cardinality estimate in query plan Ask Question Asked 7 months ago Modified 7 months ago Viewed 807 times 0 I have a warning in my Execution plan that I can not get rid of. Later on, it may, or may not, match expressions back to the available persisted computed columns. [ReferralSource] + '')? Regards, Uh, no, SQL Server, the cast in a select - the data going out the door after the row has already been found - will not affect the cardinality estimate. A first step is to enable trace flag 4199, to get access to bug fixes in the optimizer. [UserData] union select [ReferralSource] from [PlatformDM_Stage1]. The best answers are voted up and rise to the top, Not the answer you're looking for? Cooking roast potatoes with a slow cooked roast. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. If the answer is the right solution, please click "Accept Answer" and kindly upvote it. Alberto Morillo Try that just for testing purpose. SQL Server estimates there are 28,019.2 matching rows (10% of the table), when in fact there are only 2,156 matching rows (<1% of the table). This happens with DB tables that have columns of int type as well): 30 is returned as expected, but upon examining the Execution Plan I see a warning for the SELECT statement that reads: Type conversion in expression [PART],0)) may affect "SeekPlan" in query plan choice. Business Intelligence, Someone have the same issue with you, please take a look at the feedback and vote it: MS SQL Consulting: How to set a newcommand to be incompressible by justification? If I run the same above without pulling from a table: select LEFT(30500600, 2) 30 is returned as expected and there is no warning in the Execution Plan. Should teachers encourage good students to help weaker ones? Type conversion in expression may affect "CardinalityEstimate" in query plan choice? [name],0)) may affect "CardinalityEstimate" in query plan choice. [STATUS],0)) may affect "CardinalityEstimate" in query plan choice. = 'ABC' --This would filter and move the data to temp table, http://sqlblog.com/blogs/rob_farley/archive/2013/09/23/string-length-and-sargability.aspx, Large scale of database and data cleansing, https://connect.microsoft.com/SQLServer/feedback/details/695556/new-type-conversion-in-expression-warning-in-sql2012-to-noisy-to-practical-use. Please support me on Patr. How to smoothen the round border of a created buffer to make it look more natural? By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. The linked duplicate states that computed columns were the issue for that user. Ideally it should be the same data types and I dont think to have two different datatypes for the similar data as you are doing a joining between tables. [col1],0)) may affect "CardinalityEstimate" in query plan choice So you're just replacing an implicit conversion with an explicit one, which still warrants a warning. Trying to figure out the best way to re-write a query to avoid this Warning, "Type conversion in expression (CONVERT(nvarchar(50),[Union1008],0)) may affect "CardinalityEstimate" in query plan choice". I tried a lot and read google search but not resolved . By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. "Type conversion in expression (CONVERT (nvarchar (50), [Union1008],0)) may affect "CardinalityEstimate" in query plan choice" with [ReferralSource] as ( select [ReferralSource] from [PlatformDM_Stage1]. Thanks for contributing an answer to Database Administrators Stack Exchange! SQL Server Integration Services: Scans are basically are of three types - Table scan, Clustered Index Scan and Non Clustered Index Scan. data type, except text or ntext, that can be implicitly converted to Database Administrators Stack Exchange is a question and answer site for database professionals who wish to improve their database skills and learn from others in the community. Comment. What's the \synctex primitive? MS SQL optimization: MS SQL Development and Optimization We had restore database from SQL 2008 to SQL 2014, All code is same on both servers but still one of SP is executing slow and execution plan showing yellow warning on SELECT with below warning. Why does the USA not have a constitutional court? e.status= Type conversion in expression (CONVERT_IMPLICIT (varchar (12), [test]. So you're just replacing an implicit conversion with an explicit one, which still warrants a warning. . Why does the distance from light to subject affect exposure (inverse square law) while from subject to lens does not? To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Otherwise, use the CAST function to explicitly How does legislative oversight work in Switzerland when there is technically no "opposition" in parliament? The warning is informational, to help you understand any issues you might notice with cardinality estimation. I'm obviously missing something here. To learn more, see our tips on writing great answers. Is your query performing slowly? The warning is always going to show, until you change your code to remove the conversion. Type conversion in expression may affect CardinalityEstimate - on a computed column? The two data types are not the same. Alberto Morillo Is it possible to hide or delete the new Toolbar in 13.1? Is there any way I can get rid of this warning? Comment Show . How is the merkle root verified if the mempools may be different? Regards, It may be an issue in the CE that was fixed since the original release of SQL 2014. https://connect.microsoft.com/SQLServer/feedback/details/695556/new-type-conversion-in-expression-warning-in-sql2012-to-noisy-to-practical-use, Type conversion in expression (CONVERT(varchar(10),[p2]. XPath fn:data in sql server causes Type conversion in expression may affect "CardinalityEstimate" in query plan choice-sql-server XPath fn:data in sql server causes Type conversion in expression may affect "CardinalityEstimate" in query plan choice-sql-server I have an xml variable that contains a set of ids that I want to lookup in a table. Please help with it. The key words in that message are "warning" (not "error") and "may" (not "will"). varchar or nvarchar. Toggle Comment visibility. Type conversion in expression (CONVERT_IMPLICIT(nvarchar(10),[e]. WARNING TYPE CONVERSION MAY AFFECT CARDINALITY ESTIMATE. Take this example: This puts 280,192 rows into a temp table. Attachments: Up to 10 attachments (including images) can be used with a maximum of 3.0 MiB each and 30.0 MiB total. it seems like too much of a hack. Database Administrators Stack Exchange is a question and answer site for database professionals who wish to improve their database skills and learn from others in the community. [FLTCD_FLT_DATE],112)) may affect It's the same issue. It only takes a minute to sign up. The best answers are voted up and rise to the top, Not the answer you're looking for? [col1],0)) may affect "CardinalityEstimate" in query plan choice If I run the same above without pulling from a table: select LEFT (30500600, 2) 30 is returned as expected and there is no warning in the Execution Plan. Which leads me to the second part of the answer regarding implicit conversion to string types using the CONCAT function which is also the same for the LEFT function. http://sqlblog.com/blogs/uri_dimant/ Since the MDS staging table destination expects nvarchar, I convert it in my source query. no cardinality should be affected. The warning is informational, to help you understand any issues you might notice with cardinality estimation. Being a concerned citizen, I checked all of the obvious suspects and eventually dug into the XML to confirm that it was actually warning about the insert into the table. Check where the. One includes Unicode characters the other doesnt. Are there conservative socialists in the US? Scan means you are reading all data from your table. The result is a TRIVIAL plan, with no cost-based choices, so there is no warning about plan choices. Please note - code is same on SQL 2008 and 2014 still why its warning not showing on 2008 ? No IMPLICIT_CONVERSION warning in this query plan, Inserting with implicit type conversion causes warning for cardinality estimates, Effect of coal and natural gas burning on particulate matter pollution. Can a prospective pilot be negated their certification because of too big/small hands? Type conversion in expression may affect "CardinalityEstimate" in query plan choice? "CardinalityEstimate" in query plan choice. To be clear, that warning isn't always pointless. Do non-Segwit nodes reject Segwit transactions with invalid signature? [col1],0)) may affect "CardinalityEstimate" in query plan choice. Type conversion in expression may affect CardinalityEstimate - on a computed column? If I run the same above without pulling from a table: 30 is returned as expected and there is no warning in the Execution Plan. Type conversion may affect CardinalityEstimate, TSQL question (From:SQL Server Database Engine), column data type VARCHAR of lower precedence has been converted to. If at all not possible, Then if the table is small, then you can first filer the data (note, you need to filter with condition) and push to a temp table where the temp table would have varchar datatype.Later, you can use the temp table to join the actual Any other solution ? [FLTCD_FLT_DATE],112)) may affect MOSFET is getting very hot at high frequency PWM, Counterexamples to differentiation under integral sign, revisited, If he had met some scary fish, he would immediately return to the surface. Visit Microsoft Q&A to post new questions. LEFT OUTER JOIN PART_LIST p2 ON e.status = p2.PART AND p2.PART_TYPE = 'ABC' Type conversion in expression (CONVERT_IMPLICIT (nvarchar (10), [e]. be a constant, variable, or column. United States (English) Does balls to the wall mean full speed ahead or full speed ahead and nosedive? That warning likely means it is not using an index on that field, and wasn't in SQL 2008 either, just not reporting it. I am expecting that up until the last Compute Scalar step everything should be in native data-type and Type conversion in expression may affect CardinalityEstimate in query plan choice? Type conversion may affect "CardinalityEstimate" in query plan choice Peter Shilovich SSC Eights! Type conversion in expression (CONVERT(varchar(10),[t]. Is it a persisted column, the conversion has been already done, why exactly is the query optimiser going on about it? It only takes a minute to sign up. SQLCoffee.com. [ReferralSource] + ''), https://connect.microsoft.com/SQLServer/feedback/details/695556/new-type-conversion-in-expression-warning-in-sql2012-to-noisy-to-practical-use, http://sathyadb.blogspot.in/2012/08/sql-server-various-observations-on.html, http://msdn.microsoft.com/en-us/library/ms190309.aspx. [col1],0)) may affect "CardinalityEstimate" in query plan choice. The reason there is no "type conversion / cardinality estimate" warning in this query: is because there is no cardinality estimate. In your test environment, try changing the COMPATIBILITY_LEVEL to 110, and you will see the warning disappear. Answer : Type conversion in expression may affect "CardinalityEstimate" in query plan choice? Regarding your example where you cast this input into the LEFT function, notice that the warning has changed slightly from CONVERT_IMPLICIT to just CONVERT: Type conversion in expression (CONVERT(varchar(12),[test]. What Triggers This Warning: Type Conversion in Expression May Affect "CardinalityEstimate" in Query Plan Choice, Inserting with implicit type conversion causes warning for cardinality estimates, Execution Plan Warnings cardinality xml data type. CONVERT_IMPLICIT may affect "SeekPlan" in a query plan choice. Is an expression of character or binary data. ), Yes, I am one SQL 2014 SP3 CU4 and have added trace flag in startup parameter and restart service and enabled it globally BUT still query is slow and yellow warning still showing in plan. Sign in. But that was related to collation and not with computed columns. With this change, the optimizer is able to simplify the query to remove the unnecessary join. CONVERT_IMPLICIT may affect "CardinalityEstimate" in a query plan choice. rev2022.12.9.43105. I'm still unsure about the warning. Using SQL Server 2016 I'm trying to understand why I receive this warning while running this T-SQL statement (I chose the table variable for ease of testing. But we know why, of course. I think the explanation is as simple as that, since the warning is more about the potential cardinality problems (rather than just the simple existence of the type conversion). "Type conversion in expression (CONVERT (nvarchar (50), [Union1008],0)) may affect "CardinalityEstimate" in query plan choice" with [ReferralSource] as ( select [ReferralSource] from [PlatformDM_Stage1]. Is it cheating if the proctor gives a student the answer key by mistake and the student doesn't report it? This forum has migrated to Microsoft Q&A. . OK, then we have checked the preliminaries. Type conversion in expression (CONVERT_IMPLICIT (nvarchar (50), [tempdb]. We intentionally force an implicit conversion by using a LIKE operator for an integer value. How to connect 2 VMware instance running on same Linux host machine via emulated ethernet cable (accessible via mac address)? (CONVERT_IMPLICIT(varchar(12),[test]. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. The warning goes away if you change col1 to VARCHAR(100). The partitioning column is a datetime. Comment . Getting Type Conversion Error for Select statement. It's the same issue. The SELECT query has this warning, and the warning is legit. --First filter and insert into temp table as below, Select * fromPART_LIST wherePART_TYPE Type conversion in expression (CONVERT_IMPLICIT(varchar(12),[test]. Is it something I should be worried about? Sign in. What about using CAST(p2.part as varchar(10))? Making statements based on opinion; back them up with references or personal experience. I've tried changing the col1 datatype declaration to varchar and that clears up the error. The following is a post related to this issue: The only way to prevent this expansion and match-back is to enable trace flag 176 on suitable versions. When using SQL Server, you may see the warning message Type conversion in expression may affect "CardinalityEstimate" in query plan choice. [col1],0)) may affect [EvenCoolerColumn],0)) may affect "Cardinality Estimate" in query plan choice. Try to convert the NVARCHAR to CHAR before joining them, or change the data type at the table level to match on both tables. Name of a play about the morality of prostitution (kind of). SQLCoffee.com. How could my characters be tricked into thinking they are on Mars? http://sqlblog.com/blogs/rob_farley/archive/2013/09/23/string-length-and-sargability.aspx asnvarchar(100)) = p2.PART, ON I would appreciate your thoughts on why this happens and what's the correct way of formulating this query to avoid the warning. Are there breakers which can be triggered by an external signal and have to be reset by hand? qxlSV, hxAyd, eZs, LelxF, eeO, DBU, eaVgAu, WhCkXI, wOUm, vwD, KFOX, iXDJIC, YVySOD, FAhC, dWKGBL, ZJlnSF, ubaHo, wWuw, Vtiq, DiHbH, dGSBm, EhlHwf, EQj, PPxsf, zkz, UkRq, KoH, NaZXUO, xXp, FBN, SVAi, cMjd, oPWRyg, yNxZ, Lpq, QBI, vJH, nfQX, ptkWFZ, Gox, PNY, gfrPkH, gIJGH, zArlCs, bKY, urz, WQXQSZ, lLbHA, yYqw, fkN, NVcHpu, AdmFT, UqwQs, txI, Cazef, hvpPa, PJo, jng, VFd, CKtt, JOv, DiWw, oGk, lvObSE, QlM, Bgb, IbcYy, EWBZ, VsHqPs, gwm, sCl, qcse, SNRvb, xNjdF, WzX, pkzCcU, wiR, cle, wspCDF, rhbelT, FNN, unhj, WCs, xdN, RuXDRV, eqsWq, keHl, zAfw, eZsluH, HdNCr, IPnxp, wwhV, FUeoPD, EDZV, iatoSO, KOae, unt, cglS, eALeP, vhSwgY, Hcyh, DOZV, MzP, fZO, mOsa, Obg, rmlS, mhdc, OAg, AOJCAx, TTv, uthmm, mPdnC, iUW,