The SQL CASE statement is used to check conditions and perform tasks on each row while selecting data. In this tutorial, you will learn about the SQL CASE statement with the help of examples.
1.CASE 写法如下: CASE WHEN condition1 THEN result1 WHEN condition2 THEN result2 WHEN conditionN THEN resultN ELSE result END; 解释:1)先匹配第一条,不匹配的话继续第二条,如此循环,
Examples A. Use a SELECT statement with a simple CASE expression Within aSELECTstatement, a simpleCASEexpression allows for only an equality check; no other comparisons are made. The following example uses theCASEexpression to change the display of product line categories to make them more understa...
Examples A. Use a SELECT statement with a simple CASE expression Within aSELECTstatement, a simpleCASEexpression allows for only an equality check; no other comparisons are made. The following example uses theCASEexpression to change the display of product line categories to make them more understa...
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CASE表达式是用来判断条件的,条件成立时返回某个值,条件不成立时返回另一个值。 语法: CASEWHENComparsionConditionTHENresultWHENComparsionConditionTHENresultELSEotherEND (注:各分支返回的数据类型需一致。) (注:when子句一定要有排他性,因为当when子句为真时,剩余的when子句会被忽略。) ...
CASE statement based on TIME field case statement for count between two dates CASE statement in SQL returns Null CASE statement in WHERE clause for IS NULL: I want to say IS or IS NOT Null for a column using CASE Case Statement in Where clause with parameters SQL Server CASE statement incl...
Examples A. Using a SELECT statement with a simple CASE expression Within a SELECT statement, a simple CASE expression allows for only an equality check; no other comparisons are made. The following example uses the CASE expression to change the display of product line categories to make them ...
Here are two, TSQL examples: -- Using an explicit transaction BEGIN TRANSACTION; DELETE FROM HumanResources.JobCandidate WHERE JobCandidateID = 13; COMMIT; -- the ROLLBACK statement rolls back the INSERT statement, but the created table still exists. CREATE TABLE ValueTable (i...
Note: Starting with SQL Server 2012 (11.x) Service Pack 3 and SQL Server 2014 (12.x) Service Pack 1, this behavior is controlled by the Database Engine and Trace Flag 1236 has no effect.Scope: Global only. 1237 Allows the ALTER PARTITION FUNCTION statement to honor the current user-...