{ sql_statement|statement_block }[ELSE { sql_statement | statement_block }] 示例: DECLARE@scoreINTSET@score=100IF@score>=60PRINT'及格'ELSEPRINT'不及格' 3 CASE语句 CASE语句是多条件分支语句,相比IF...ELSE语句,CASE语句进行分支流程控制可以使代码更加清晰,易于理解。CASE语句根据表达式逻辑值的真假来决...
sql case statement
select a, (case a when 1 then '中' else '国' end) AS B from table1 2.sqlserver字符串拆分(split)方法汇总 :http://www.cnblogs.com/aierong/archive/2008/11/19/sqlserver_split.html 二、WAITFOR WAITFOR { DELAY time | TIME time | (receive_statement) [TIMEOUT timeout] } 说明: DELAY 可...
SQL Server allows for only 10 levels of nesting inCASEexpressions. TheCASEexpression can't be used to control the flow of execution of Transact-SQL statements, statement blocks, user-defined functions, and stored procedures. For a list of control-of-flow methods, seeControl-of-Flow Language (...
Server 2008中的多个字段签入case语句 、、 Case语句语法(MySQL):- WHEN search_condition THEN statement_listEND CASESimple CASE expression: 浏览3提问于2014-01-17得票数 0 回答已采纳 2回答 SQL Server Case语句 、、、 我正在尝试运行这条sql语句,但它生成了错误“update附近的语法不正确” When 'Media...
SQl Server——流程控制语句 IF...ELSE语句:条件处理语句 IF Boolean_expression {sql_statement|statement_block} ELSE {sql_statement|statement_block} 需求:查询成绩表sc编号为801,学科为01这门课程所有学生的平均分,以此来对学生表现进行评价 declare @num int --声明变量...
{ sql_statement | statement_block } [ ELSE { sql_statement | statement_block } ] 1. 2. 3. 4. CASE 多条件分支选择 CASE 实现多分支选择结构,类似于 C 语言的 Switch。CASE具有以下两种格式,首先是简单表达式,将某个表达式与一组简单表达式进行比较以确定结果。
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.
SQL Server 数据库引擎可处理对多种数据存储体系结构(例如,本地表、已分区表以及分布在多个服务器上的表)执行的查询。 以下部分介绍了 SQL Server 如何处理查询并通过执行计划缓存来优化查询重用。执行模式SQL Server 数据库引擎可使用两种不同的处理模式处理 Transact-SQL 语句:...
SQL Server allows for only 10 levels of nesting in CASE expressions. The CASE expression can't be used to control the flow of execution of Transact-SQL statements, statement blocks, user-defined functions, and stored procedures. For a list of control-of-flow methods, see Control-of-Flow Lan...