sql case statement
{ 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 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:...
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 (...
(SELECT SUBSTRING(text, statement_start_offset/2 + 1, (CASE WHEN statement_end_offset = -1 THEN LEN(CONVERT(nvarchar(max), text)) * 2 ELSE statement_end_offset END - statement_start_offset)/2) FROM sys.dm_exec_sql_text(sql_handle)) AS query_text ...
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 AI检测代码解析...
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 (...
SQL Server:具有多种可能条件的Case语句中的模式匹配 我正在SQL Server中编写一个查询,试图根据多个“模糊匹配”条件生成一个数据指示器。演示此任务的一些示例代码: CASE WHEN COLUMN_1 IN ('CRITERIA_A') AND COLUMN_2 NOT LIKE '%FUZZY_MATCH_A%' OR...
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.