分组前的MySQL LIMIT？

Question

我想将分组结果限制为30，但我将所有行分组，然后将其限制为30组。我该怎么做？

SELECT *, COUNT(*) AS COUNT FROM `Posts` GROUP By `Category` LIMIT 30

Answer 1

SELECT *, COUNT(*) AS COUNT FROM (SELECT * FROM `Posts` LIMIT 30) t GROUP By `Category`