使用CASE语句可以进行多个分支的选择。CASE具有两种格式: 简单CASE格式:将某个表达式与一组表达式进行比较以确定结果。 搜索CASE格式:计算一组布尔表达式以确定结果。 注: CASE语句只能用于SQL语句的一部分,不能独立成句。 1)简单CASE格式 其语法格式如下: CASE input_expression WHEN when_expression THEN result_expr...
CASE表达式是标量表达式,返回一个符合条件的值。注意,CASE是表达式,不是语句,与COUNT类似。 CASE表达式有两种使用方式: CASE后面带有列名 这种情况下,WHEN子句中只能使用标量或返回标量的表达式,这种形式称为简单格式。 代码语言:txt AI代码解释 SELECT Name, CASE Age WHEN 50 THEN '知天命' WHEN 1+1 THEN '' ...
There are times where you need to write a single TSQL statement that is able to return different TSQL expressions based on the evaluation of another expression. When you need this kind of functionality you can use the CASE expression or IIF function to meet this requirement. In this article I...
SSRS Switch Case Default Value SSRS Switch Expression for Background Color Not Working SSRS switch statement is evaluating every also the conditions that are not true SSRS take leading Zero out from a number SSRS Temporary Report Snapshot Files do not seem to be purged SSRS time difference ssr...
T-SQL支持IF,IF-ELSE,IF-ELSE IF等多种方式 其中IF的条件判断有IF,IF NOT,IF EXISTS三种形式 DECLARE@numintset@num=5IF@num=0PRINT'000000000000'ELSEIF@num=1PRINT'11111111'ELSEPRINT'222222222'go CASE WHEN用法 CASEinput_expression WHENwhen_expressionTHENresult_expression ...
TRY { sql_statement | statement_block } END TRY BEGIN CATCH { sql_statement | statement_block } END CATCH 十七:使用Try…Catch语句。“类别”表中类别编号为5的类别记录,其代码如下: Northwind BEGIN TRY DELETE类别WHERE类别ID=5 END TRY BEGIN CATCH PRINT ’出错信息为:' + ERROR_MESSAGE() DELETE...
Access Code - DELETE Statement with DISTINCTROW and T-SQL Access Now() vs. T-SQL GETDATE() ? ADD and SUBTRACT depending on the condition is CASE STATEMENT ADD COLUMN to variable table? Add prefix in data column Add Time in SQL HH:MM:SS to another HH:MM:SS Adding a column to a lar...
执行SQL查询,可以使用Statement的()方法 A. executeQuery() B. executeUpdate() C. execute() D. query() 查看完整题目与答案 执行一个修改或插入语句,返回的布尔值表示语句是否执行成功,应使用方法Statement的()方法 A. executeQuery() B. executeUpdate() C. execute() D. change() 查看完整...
-- Expression in a SELECT statement<expression>::={ constant |scalar_function| column | variable | ( expression ) | {unary_operator} expression | expression {binary_operator} expression } [COLLATEWindows_collation_name]-- Scalar Expression in a DECLARE , SET , IF...ELSE , or WHILE statemen...
WAITFOR(<statement>) [,TIMEOUT ] Another T-SQL enhancement in Yukon allows you to return output from Data Manipulation Language (DML) statements other than SELECT (INSERT, UPDATE, DELETE). A new OUTPUT clause allows you to request that the old/new images of the columns be returned by ref...