过滤的计数和没有子查询的总计数

时间:2012-08-28 12:21:13

标签: mysql sql count

假设我有一个这样的表:

ID     Result
-------------
 1  ,  'pass'
 2  ,  'pass'
 3  ,  'fail'
 4  ,  'fail'
 5  ,  'fail'
 6 ,   'fail'

有没有简单的方法可以找到COUNT WHERE result = 'fail' AND total COUNT

预期产出:

FailCount    TotalCount
-----------------------
    4            6

是的,我们可以使用这样的子查询来做到这一点:

SELECT 
(SELECT COUNT(result) FROM t WHERE result='fail') AS FAILCount
, COUNT(result)
AS TotalCount FROM t;

但有没有办法做到这一点:

SELECT COUNT(WHERE Result='fail') , COUNT(Result) FROM ...

I am trying in this fiddle.

3 个答案:

答案 0 :(得分:15)

ANSI SQL

SELECT 
   SUM(CASE WHEN Result='fail' THEN 1 ELSE 0 END) , 
   COUNT(*) FROM ...

SQLFiddle Demo

MySQL特定(正如eggyal指出的)

SELECT 
       SUM(Result='fail') , 
       COUNT(*) FROM ...

SQLFiddle Demo

答案 1 :(得分:4)

是的,我们也可以这样使用:

SELECT 
   COUNT(CASE WHEN Result='fail' THEN 1 ELSE NULL END) , 
   COUNT(*) FROM ...

See this SQLFiddle

答案 2 :(得分:0)

SELECT 
   SUM(CASE WHEN Result='fail' THEN 1 ELSE 0 END) as FailCount, 
   COUNT(Result) as TotalCount FROM table_name