In SQL Server there is anIF…ELSE control flow statement. However, it cannot be used inside a SELECT statement. The closest of IF…THEN operation which can be used in SELECT statements is CASE expression or the IIF function. Let us see how to use CASE and IIF using an example. For thi...
代码:SELECT * FROM `usertable` ORDER BY `age` DESC,`userid` ASC另外,可以根据表达式进行排序。 二、联合查询 UNION运算符可以将两个或两个以上上SELECT语句的查询结果集合合并成一个结果集合显示,即执行联 合查询。 UNION的语法格式为: 代码:select_statement UNION [ALL] selectstatement [UNION [ALL] sel...
1 SELECT IIF(5 > 3, 'TRUE', 'FALSE' ) Example 2: SQL IIF statement with variablesIn the following example, we specified two integer variables and assigned values. We use variables for comparison in the IIF statement. 1 2 DECLARE @A INT = 80, @B INT = 70 SELECT IIF(@A >= @B,...
For more information, seeIIF Function Query Hints in SQL Server Analysis Services 2008andExecution Plans and Plan Hints for MDX IIF Function and CASE Statement. Examples The following query shows a simple use ofIIFinside a calculated measure to return one of two different string values when the ...
The result of this statement is an error. C. IIF with NULL parameters SQL DECLARE@PINT=NULL, @SINT=NULL;SELECT[Result] =IIF(45>30, @P, @S ); Here is the result set. Result --- NULL Next steps CASE (Transact-SQL) CHOOSE (
SELECT[Result] =IIF(45>30,NULL,NULL); The result of this statement is an error. C. IIF with NULL parameters SQL DECLARE@PINT=NULL, @SINT=NULL;SELECT[Result] =IIF(45>30, @P, @S ); Here's the result set. Result --- NULL Next steps...
SELECT IIF ( 45 > 30, NULL, NULL ) AS Result; The result of this statement is an error. C. IIF with NULL parameters DECLARE @P INT = NULL, @S INT = NULL; SELECT IIF ( 45 > 30, @p, @s ) AS Result; Here is the result set. ...
SELECT[Result] =IIF(45>30,NULL,NULL); The result of this statement is an error. C. IIF with NULL parameters SQL DECLARE@PINT=NULL, @SINT=NULL;SELECT[Result] =IIF(45>30, @P, @S ); Here's the result set. Result --- NULL Next steps...
SELECTreason, score, script = JSON_VALUE(details,'$.implementationDetails.script'), planForceDetails.*, estimated_gain = (regressedPlanExecutionCount + recommendedPlanExecutionCount) * (regressedPlanCpuTimeAverage - recommendedPlanCpuTimeAverage)/1000000, error_prone =IIF(regressedPlanErrorCount > recomm...
IIF(<condition>,<expression if true>,<expression if false>) It’s a shorthand for a searched CASE. Let’s rewrite the following statement: SELECT [BusinessEntityID],[MaritalStatus],MaritalStatusDesc=CASE WHEN [MaritalStatus]='S'THEN'Single'ELSE'Married'END ...