SQL 条件语句 (IF, CASE WHEN, IFNULL) 1、IF 1.1 表达式: IF( expr1 , expr2 , expr3 ) expr1条件,条件为true,则值是expr2 ,false,值就是expr3 示例; SELECT o.id,u.account,catagory
[ELSE statement_list] END CASE;案例根据传入的月份,判定月份所属的季节(要求采用case结构)。1-3月份,为第一季度 4-6月份,为第二季度 7-9月份,为第三季度 10-12月份,为第四季度create procedure p(in month int) begin declare result varchar(10); case when month >= 1 and month <= 3 then set...
Second, IF statement condition is FALSE, it does not print the message inside IF statement block 其次,IF语句条件为FALSE,它不会在IF语句块内打印消息 It executes the ELSE statement and prints the message for it. In this case, we have two SQL IF statements. The second IF statement evaluates t...
Therefore, optionally you can use the ELSE condition within the IF…ELSE statement. You should not use an ELSE IF condition in the IF ELSE statement. But, you can use nested (multiple) IF ELSE statements to obtain your results. Let’s have a quick example to learn the IF ELSE statements...
else case statement query in SQL ServerThis creates start and end columns by doing a CASE WHEN....
The IF ELSE statement controls the flow of execution in SQL Server. It can be used in stored-procedures, functions, triggers, etc. to execute the SQL statements based on the specified conditions. Syntax: Copy IF Boolean_expression { sql_statement | statement_block } [ ELSE { sql_statement...
多表SQL SELECT语句 Select Case in SQL语句 如何在SQL Select语句中编写条件 使用If语句赋值的SQL Select 使用SQL Server的Select语句 如何在SQL Server中对条件使用select语句 SQL Case语句条件 使用SELECT语句返回INSERT INTO语句 SQL -连接多个Select语句 参数化SQL SELECT语句 SQL SERVER 2008 Select语句 帮...
与上述语句不同的是,该语句中的 WHEN 语句将被逐个执行,直到某个 search_condition 表达式为真,则执行对应 THEN 关键字后面的 statement_list 语句。如果没有条件匹配,ELSE 子句里的语句被执行。 这里介绍的 CASE 语句与“控制流程函数”里描述的 SQL CASE 表达式的 CASE 语句有轻微的不同。这里的 CASE 语句不...
else case statement query in SQL ServerThis creates start and end columns by doing a CASE WHEN....
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