[英]Get MAX value in mysql query
I have a table 我有一张桌子
id mid userid remarks
1 2 8 7
2 2 8 6
3 2 8 4
4 2 8 5
5 2 8 2
6 2 8 3
7 2 8 7
8 2 8 0
9 2 8 1
10 2 8 8
I need the last row of remark before that row. 我需要在该行之前的最后一行备注。 ie, remark '1' 即,评论'1'
SELECT MAX(id),mid,userid,remarks FROM sample
Select Id,mid,userid,remarks from sample Where id<(select max(Id) from sample)
order by id desc limit 1
Or 要么
Select Id,mid,userid,remarks from sample
order by id desc limit 1 offset 1
Try this: 尝试这个:
SELECT MAX(id),mid,userid,remarks
FROM sample WHERE id NOT IN (
SELECT MAX(id) FROM sample
)
GROUP BY mid,userid,remarks
EDIT 编辑
See if this works 看看这是否有效
for mysql Node.js developers especially 特别是对于mysql Node.js开发人员
I was unable to get direct-value in mysql-driver for node.js ie when I run the following query 我无法在node.js的mysql-driver中获得直接值,即当我运行以下查询时
SELECT MAX(id) FROM Users
and I got the result as [RowDataPacket { MAX(id): 1 }]
我的结果为[RowDataPacket { MAX(id): 1 }]
I tried to retrieve the value from object console.log(MAX(id))
, but I couldn't 我试图从对象console.log(MAX(id))
检索值,但我不能
so I set an alias
ie maxid
所以我设置了一个alias
即maxid
SELECT MAX(id) as maxid FROM Users
and got it as [RowDataPacket { maxid: 1 }]
得到它作为[RowDataPacket { maxid: 1 }]
Which I can retrieve as console.log(maxid)
哪个我可以检索为console.log(maxid)
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