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mysql iF ElsE语句

看你语句里面的IF函数例子: IF(g.give_integral > -1, g.give_integral, c.goods_price) 这个函数的结果要根据g.give_integral的值,如果g.give_integral大于-1函数值就是g.give_integral,否则函数值就是c.goods_price。

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

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...

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

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')

tabname(id,name)1,a2,bselect id,name ,if(id=1,'id是1','id不是1') as tttfrom tabname;或者 select id,name , case when id =1 then 'id是1' else 'id不是1' end as tttfrom tabname;结不美观:id name ttt1 a id是12 b id不是1

select *,if(sva=1,"男","女") as ssva from tableame where id =1 Quote 控制流程函数 CASE value WHEN [compare-value] THEN result [WHEN [compare-value] THEN result ...] [ELSE result] END CASE WHEN [condition] THEN result [WHEN [con...

if (@num1 < @time) AND (@num2 < @time) AND (@num3 < @time) then

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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