mysql - mysql 计数帮助

Question

我正在尝试计算具有区域的表中的行数，我该如何实现这一点，我目前已经编写了这个查询，

SELECT DISTINCT area 
  FROM cv 
 WHERE status = 'SHOW' 
   AND is_complete = 'TRUE' 
ORDER BY area ASC

此查询当前返回，

area
------------------
West Yorkshire  
Lanchashire

我想要的是类似的东西，

area             Number
------------------------
West Yorkshire   19000  
Lancashire       7000

score 4 · Accepted Answer

4

select area, count(*)
from cv
where status = 'SHOW' 
    and is_complete = 'TRUE' 
group by area

于 2010-06-22T15:49:00.797 回答

score 3 · Accepted Answer

SELECT area, COUNT(area)
  FROM cv
WHERE status = 'SHOW'
  AND is_complete = 'TRUE'
GROUP BY area

面积计数将仅计算非空值

score 1 · Accepted Answer

SELECT area, COUNT(area)
  FROM cv
WHERE status = 'SHOW'
  AND is_complete = 'TRUE'
  AND area IS NOT NULL
GROUP BY area

score 0 · Accepted Answer

sql distinct 将仅列出表中的不同值，您的原始查询也需要具有 count() 和 group by：

SELECT DISTINCT area, count(*) 
  FROM cv
.....

group by area

或者，Red Filer 和 gkrogers 的回答也很好。

4 回答 4