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mysql sElECt CAsE语句吗

MySql数据库不支持select case语句,但是它支持功能类似的case when函数。下面是函数的有关语法和使用示例: 语法1 CASE WHEN expr1 THEN v1 [WHEN expr2 THEN v2...][ELSE vn] END 例句: select id,grade,case when grade>60 then 'good' when...

(1)数字 如果 Measures.CurrentMember 是空单元,则下面的示例返回 0,否则返回 1 IIf(IsEmpty(Measures.CurrentMember), 0, 1) (2)字符串 如果Measures.CurrentMember 是空单元,则下面的字符串返回字符串"Yes",否则返回字符串"No" IIf(IsEmpt...

select * case when userfen>400 then '金牌会员' when userfen>300 and userfen 200 and userfen

你是要按月分和销售人员来对销售额透视,而sql语句只对月份分组,正确结果应该增加分组维度 select月份,sum (case when 销售人员='姓名1' then 销售数量*产品单价 else 0 end) as 姓名1销售额,sum (case when 销售人员='姓名2' then 销售数量*产...

去这个地方看看就明白了: http://zhidao.baidu.com/question/336737352.html 我已经回答过了。

可以的,group by后边整个条件 就是列: CASE country WHEN'中国' THEN'亚洲' WHEN'印度' THEN'亚洲' WHEN'日本' THEN'亚洲' WHEN'美国' THEN'北美洲' WHEN'加拿大' THEN'北美洲' WHEN'墨西哥' THEN'北美洲' ELSE'其他'END

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...

Declare @Data VarChar(20) Set @Data = '' Select Case When @Data Is NULL Then NULL When @Data = '' Then 'Data is empty' End 或者: CASE WHEN (ID IS NULL) THEN 'YES' ELSE 'NO' END AS ID_Value,

mysql不太熟,不过你的要求就是简单嵌套就行了吧。 select @sum_rece:=s1+s2+s3+s4...+s10 from ( select (case when rece_day1 is null then rece_amt1 else 0) s1, (case when rece_day2 is null then rece_amt2 else 0) s2, 。。。。 from ...

select case stf.stationType when 'RAIN' then '雨情站' when 'RECIMEI' then '水位站' else '流量站' end tationName from radar_stations_info stf

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