Mysql删除重复数据保留最小的id 的解决方法

2024-11-24 01:12:26
推荐回答(1个)
回答1:

在网上查找删除重复数据保留id最小的数据,方法如下:
DELETE
FROM
people
WHERE
peopleName
IN
(
SELECT
peopleName
FROM
people
GROUP
BY
peopleName
HAVING
count(peopleName)
>
1
)
AND
peopleId
NOT
IN
(
SELECT
min(peopleId)
FROM
people
GROUP
BY
peopleName
HAVING
count(peopleName)
>
1
)
自己使用的时候显示报错:
delete
from
tb
where
id
in
(SELECT
max(id)
from
tb
GROUP
BY
user
HAVING
count(user)>1)
[Err]
1093
-
You
can't
specify
target
table
‘XXX'
for
update
in
FROM
clause
暂时不知道是什么原因导致的。
然后想办法分布操作,首先筛选出有重复user的亏厅数据,然后用max()选春蠢出其中较大的那一行:
SELECT
max(id)
from
tb
GROUP
BY
user
HAVING
count(user)>1
然后再根据得到的max(id)逐条删除多余的数据
delete
from
tb
where
id=xx
是个笨方法,暂时先解决问题吧。
总结
以上所述是小编给大家介绍的Mysql删除重复数据保留最小的id
的解决方法,希望对大家有所帮助,如果大家有任何疑问欢迎给我留言,小编会及时回复扒空陪大家的!