mysql 篩選重復項（單列或者多列同時重復）mysql去重

原文：https://blog.csdn.net/luyaran/article/details/80929026

 

-------------單列-----------------------

SELECT
檢查字段,
COUNT(檢查字段)
FROM
table_name
GROUP BY 檢查字段
HAVING COUNT(檢查字段) > 1

 

-------------多列------------------

SELECT
檢查字段1, COUNT(檢查字段1),
檢查字段2, COUNT(檢查字段2),
...

FROM
table_name
GROUP BY
檢查字段1,
檢查字段2, ...
HAVING
(COUNT(檢查字段1) > 1) AND
(COUNT(檢查字段2) > 1) AND