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...
Applies to: SQL Server Azure SQL Database Azure SQL Managed InstanceReturns one of two values, depending on whether the Boolean expression evaluates to true or false in SQL Server.Transact-SQL syntax conventionsSyntaxsyntaxsql Copy IIF( boolean_expression, true_value, false_value ) ...
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...
@filename1=N'D:\Program Files\Microsoft SQL Server\MSSQL15.SQLEXPRESS\MSSQL\DATA\数据库名称.mdf', @filename2=N'D:\Program Files\Microsoft SQL Server\MSSQL15.SQLEXPRESS\MSSQL\DATA\数据库名称_log.ldf' 【例】备份数据库 1 2 -- backup database <数据库名称> to disk ='磁盘路径'; backu...
Example 7: SQL IIF statement and data type precedenceWe might have different data types for the results. If we have different data types specified in the result conditions, SQL Server gives the highest precedence data type. In the following example, for the false condition(11>19), the result...
[UNION [ALL] selectstatement][…n]其中selectstatement为待联合的SELECT查询语句。 ALL选项表示将所有行合并到结果集合中。不指定该项时,被联合查询结果集合中的重复行将只保留一行。 联合查询时,查询结果的列标题为第一个查询语句的列标题。因此,要定义列标题必须在第一个查询语 ...
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...
AlterRemoteServiceBindingStatement AlterResourceGovernorCommandType AlterResourceGovernorStatement AlterResourcePoolStatement AlterRoleAction AlterRoleStatement AlterRouteStatement AlterSchemaStatement AlterSearchPropertyListStatement AlterSecurityPolicyStatement AlterSequenceStatement AlterServerAu...
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. ...
Applies to: SQL Server 2022 (16.x) Azure SQL Database Azure SQL Managed Instance Azure Synapse Analytics SQL analytics endpoint in Microsoft Fabric Warehouse in Microsoft Fabric This function returns the maximum value from a list of one or more expressions. Transact-SQL syntax conventions Syntax ...