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mysql iF ElsE

MySql 查询不支持if else流程控制,但是可以使用case函数来实现相同流程控制功能。 下面举例供参考: 根据考生分数判定是否合格 select sid,grade, case when grade

select SUM(CASE WHEN channel_type=1 AND check_status=6 THEN 1 ELSE 0 END)FROM tougao_record WHERE accept_company_id=100

两种格式,一种是时间戳,一种是日期格式 ① SELECT IF(days = 1,"是","不是") as "是否星期天" FROM (SELECT DAYOFWEEK(FROM_UNIXTIME(time,"%Y-%m-%d")) AS days FROM table) tmp; ---time是时间戳 , days = 1代表星期天 --把time 和 table 替...

select name from tb where name='li' union all select top 1 '没有这名字' from tb where not exists(select 1 from tb where name='li')

你可以试一下先输入select 'printSEQ' from 'policyexpress' where policyno='000000600326 ' into '@cnt'; 再输入if '@cnt' ='' then update policyexpress set printSEQ = '212121212' where policyno = '000000600326'; end if

你可以试一下先输入select 'printSEQ' from 'policyexpress' where policyno='000000600326 ' into '@cnt'; 再输入if '@cnt' ='' then update policyexpress set printSEQ = '212121212' where policyno = '000000600326'; end if

mysql> DELIMITER //mysql> CREATE PROCEDURE TestIfElse -> ( -> p_val INT -> ) -> BEGIN -> IF (p_val = 1) THEN -> SELECT '1' AS A; -> ELSEIF (p_val = 2) THEN -> SELECT '2' AS A; -> ELSE -> SELECT 'other' AS A; -> END IF; -> END//...

--在5.1.55中运行没问题--另外没有show version,只有select version();--你拷贝下面的代码试试?create procedure `test2`(IN cusername VARCHAR(50),IN cpassword VARCHAR(50),IN clastloginio VARCHAR(50))BEGINif exists(select * from mt_u...

select中的IF函数是if(A=B,0,other) IF语句 if a=b then 0; else 1; end if;

mysql> DELIMITER // mysql> CREATE PROCEDURE TestIfElse -> ( -> p_val INT -> ) -> BEGIN -> IF (p_val = 1) THEN -> SELECT '1' AS A; -> ELSEIF (p_val = 2) THEN -> SELECT '2' AS A; -> ELSE -> SELECT 'other' AS A; -> END IF; -> END/...

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