How do I delete every row except the last one for each day?

Posted by A B on Stack Overflow See other posts from Stack Overflow or by A B
Published on 2010-05-07T18:19:04Z Indexed on 2010/05/07 18:28 UTC
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mysql

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sql

I have a table with stock quotes that looks something like this:

id, date, stock_id, value

Every day has several rows for each stock_id (it is automatically updated every five minutes), so the table is rather big at the moment.

How do i delete every row but the last one each day for every stock_id?

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