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Selecting highest version number

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Hi Guys


I'm a bit stuck on a query and hoping someone can help. I'm sure this has a really simple solution.


Below is a simplified representation of a table and I'm trying to select all of the data but where there are instances of the same postID I want to only select the row with the highest version number.


So for instance in a select all on the table below I would expect to get IDs of 2,3 and 4.



id | postID | version
1     2           1
2     2           2
3     1           1
4     3           1

Any help is much appreciated. 

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  • Solution

Use a sub query to get the number of the most recent, then use that to join to the original table, or in your where clause condition.


FROM table 
INNER JOIN (SELECT PostId, MAX(version) as version FROM table GROUP BY PostID) mr ON mr.PostId=table.PostId AND mr.version=table.version

Make sure you have an index on PostId,Version
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