如何找到最新版本的文件？

Question

我有两个表作为tblDocument，tblDocVersions使用主键docid连接如下：

tblDocument ：docid | title

tblVersions ：id | docid | verion | datecreated | status

tblVersions可以将数据作为

id  + docid + version
----+-------+--------+
1   | 1     | 1
----+-------+---------
2   | 1     | 2
----+-------+---------
3   | 1     | 3
----+-------+---------
4   | 2     | 1
----+-------+---------
5   | 3     | 1
----+-------+---------
6   | 3     | 2
----+-------+---------

现在我需要用最新版本选择每个单独的文档......

注意：我需要从Versions中选择与最新版本号相对应的行。

Answer 1

select max(version), tab1.docid from tblDocument as tab1
inner join tblVersions as tab2 on tab1.docid = tab2.docid 
group by tab1.docid 

修改

不确定但这对您有用

select tab1.* from tblDocument as tab1
inner join tblVersions as tab2 on tab1.docid = tab2.docid 
inner join 

  (select max(version) as ver,tab1.docid from tblDocument group by tab1.docid )  d
on d.docid = tab1.docid and  d.ver = tab1.version