MySQL Count and sort rows?

It depends on your table engine. MyISAM is very fast with aggregate functions like count(*). However, InnoDB has to scan the table and count every time.

So I would not recommend count(*)ing a large InnoDB table. Instead you could store a "count" variable in a meta table and update it on inserts/updates only.

Select type, COUNT(*) from data group by type.

Short and sweet! – Aditya May 10 '10 at 16:24.

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