在MySQL 5.5 後可以使用 PARTITION BY RANGE COLUMNS(created_date) 解決這個問題。 Rotate Partition. 在經過一段時間後，我們需要更動分區表，類似新增 ... ... <看更多>

Your sample data and output imply you want this query: SELECT *, RANK() OVER (PARTITION BY SUBSTRING_INDEX(data, '>', 1) ORDER BY ... ... <看更多>

This type of partitioning is similar to partitioning by HASH, except that only one or more columns to be evaluated are supplied, and the MySQL server provides ... ... <看更多>

I had written an interesting alternative of implementing your own manual hash indexes for your table, and then I made maths and realised ... ... <看更多>

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