[英]MySQL Query with one-to-many
I am new to MySQL and need help with a query Here is some sample data with columns: 我是MySQL的新手,需要查询方面的帮助。这是一些带有列的示例数据:
modelid styleid sequence
19463 316811 0
19463 316812 1
19463 316813 2
19463 316814 3
19463 316920 4
19463 316921 5
19727 318010 0
19727 318011 2
19727 318012 1
19727 318013 3
19884 320053 0
19884 320054 1
19884 320055 2
19884 320056 3
19998 321302 0
19998 321303 1
19998 321304 2
19998 321305 3
19998 321306 4
19998 321307 5
19998 321308 6
19998 321309 7
I need to get one styleid for every modelid, preferably with a sequence of 0 or 1, but the sequence does not really matter, it can be random. 我需要为每个modelid获得一个styleid,最好使用0或1的序列,但是序列并不重要,它可以是随机的。
The Best result would be something like this, CANT USE sequence = 0 as a where clause though: 最好的结果是这样的,尽管CANT USE sequence = 0作为where子句:
modelid styleid sequence
19463 316811 0
19727 318010 0
19884 320053 0
Thanks 谢谢
Try this:: 尝试这个::
Either you can use group by
like :: 您可以使用
group by
类的::
Select modelid, styleid, sequence from myTable group by modelid
or you can use DISTINCT
或者您可以使用
DISTINCT
Select DISTINCT modelid, styleid, sequence from myTable
Try this 尝试这个
SELECT modelid, MAX(styleid),MIN(sequence)
FROM myTable
GROUP BY modelid
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