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mysql iF ElsE

不知你用的是什么查询分析器。 我记得 select count(*) into @cnt from table1 where map_id = 114 and `type` = 400 ; if @cnt > 0 then update table1 set `count` = 25 where map_id = 114 and `type` = 400; else insert table1 (map_id,`co...

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

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

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

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')

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;

@sqlz ='select asd from flkg'; EXECUTE(@sqlz); ---------- 首先,mysql下动态语句不是这样写的,另外,触发器里不能允许返回结果集的. 这里我是希望他能中断更新! --------------------- 你的意思是不是要中断后面的 " SET amount =@amountmm W...

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