insert into COLLATE SQL_Latin1_General_CP1_CS_AS AS a UDF way of doing so, CREATE FUNCTION testfn INT In your case you are return only plain variable, So variable will exhibit collate characteristics only as long as it is use along collate. Txt = COLLATE SQL_Latin1_General_CP1_CS_ASĭeclare varchar(60) COLLATE SQL_Latin1_General_CP1_CS_AS='ABC' UDF/TVF is not perform-ant way to do so.Best way is to alter tableĪnother example, declare varchar(60)='ABC'įROM (SELECT 'abc' AS txt UNION SELECT 'cdf') t When this column is use in where condition then column will exhibit characteristics of said collate. It just define the collate on that column. Then it take 1 ms to do so.That means it do not convert 5175460 rows to said collate. If i don't convert the data type and only want to change collate alter table OINVĪlter column CardCode nvarchar(50) COLLATE SQL_Latin1_General_CP1_CS_AS Then converting this to another data type will take time because its of its value is converted to new data type. This is - for sure! - much better in performance than an UDF.ĬOLLATE :Is a clause that can be applied to a database definition or a column definition to define the collation, or to a character string expression to apply a collation cast.ĬOLLATE do not convert any column or variable.It define the characteristics of collate. With set to 1 it will return just the aBc, with NULL or 0 it will return both lines. If you want to have control whether a comparison is done CS or CI you might try this: DECLARE TABLE(SomeValueInDefaultCollation VARCHAR(100)) įROM AND COLLATE Latin1_General_CS_AS) Is a clause that can be applied to a database definition or a column definition to define the collation, or to a character string expression to apply a collation cast. It applys a rule (related to NOT NULL which does not change the values, but just adds the rule whether NULL can be set or not). ,CASE WHEN tv.Rom = 'ABC' THEN 'CI' ELSE 'CS' END AS CheckRomĪt this link You can read about the details. ,CASE WHEN tv.Arab = 'ABC' THEN 'CI' ELSE 'CS' END AS CheckArab SELECT CASE WHEN tv.deflt = 'ABC' THEN 'CI' ELSE 'CS' END AS CheckDefault The comparison "knows" the specified collation: DECLARE TABLE(deflt VARCHAR(100) This applys for declared table variables also. SELECT, system_type_name, collation_nameįROM sys.dm_exec_describe_first_result_set(N'SELECT * FROM #tempTable',NULL,0) INSERT INTO #tempTable(deflt,Arab,Rom) VALUES('aBc','aBc','aBc') ,Rom VARCHAR(100) COLLATE Romanian_CI_AI) ,Arab VARCHAR(100) COLLATE Arabic_100_CS_AS_WS_SC But a table's column will behave differently: CREATE TABLE #tempTable(deflt VARCHAR(100) ,CASE WHEN = 'ABC' COLLATE Romanian_CI_AI THEN 'CI' ELSE 'CS' END AS CheckRom ,CASE WHEN = 'ABC' COLLATE Arabic_100_CS_AS_WS_SC THEN 'CI' ELSE 'CS' END AS CheckArab But we can specify the collation for one given action! SELECT CASE WHEN = 'ABC' THEN 'CI' ELSE 'CS' END AS CheckDefault ,CASE WHEN = 'ABC' THEN 'CI' ELSE 'CS' END AS CheckRom ,CASE WHEN = 'ABC' THEN 'CI' ELSE 'CS' END AS CheckArab Now we check a simple comparison of "aBc" against "ABC" SELECT CASE WHEN = 'ABC' THEN 'CI' ELSE 'CS' END AS CheckDefault All three variables are seen as the system's default collation: SELECT, system_type_name, collation_nameįROM sys.dm_exec_describe_first_result_set(N'SELECT AS Deflt, AS Arab, AS varchar(100), varchar(100)' I declare three variables, each of which get's its own collation - at least one might think so: DECLARE VARCHAR(100) = 'aBc' -Latin1_General_CI_AS in my systemĭECLARE VARCHAR(100) = 'aBc' COLLATE Arabic_100_CS_AS_WS_SC ĭECLARE VARCHAR(100) = 'aBc' COLLATE Romanian_CI_AI A variable cannot have it's own collation.
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