mysql - mySQL 仅当 count() as col1 <> col2 时才选择行

Question

我正在使用以下 SQL 语句：

SELECT Col1, count(*) as Col2, Col3
FROM table1
WHERE WeekEnding = '08/26/2012' 
GROUP BY Col1

要得到

Col1   Col2  Col3
 NY     2     2
 FL     1     2
 TX     1     2
 NJ     1     2
 WA     2     2
 DE     1     3
 MA     4     4
 AL     3     3

如何排除 COL2 = COL3 的记录，所以我得到了。

Col1   Col2  Col3
 FL     1     2
 TX     1     2
 NJ     1     2
 DE     1     3

score 2 · Accepted Answer

将其添加到您的HAVING条款中

SELECT Col1, count(*) as Col2, Col3
FROM table1
WHERE WeekEnding = '08/26/2012' 
GROUP BY Col1
HAVING (count(*) <> col3)

score 2 · Accepted Answer

您添加HAVING-完成having后group工作。Where在group.

SELECT Col1, count(*) as Col2, Col3
FROM table1
WHERE WeekEnding = '08/26/2012' 
GROUP BY Col1
HAVING Col2 != Col3

注意：您按 Col1 分组，但不是 Col3 - 这是不合法的，因为您在输出中请求 Col3。

2 回答 2