SQL - Count by range

How can I select the number of population by age group

count ( 0->10)
cou开发者_运维知识库nt ( 11->20)

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There are other question about the same, you can found the solution on: In SQL, how can you "group by" in ranges?

The syntax is valid for mysql too.

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Try this:

SELECT FLOOR(age / 10), COUNT(*)
FROM yourTable
GROUP BY FLOOR(age / 10)

Manipulate the age / 10 expression to get the exact ranges. This will return 0 for ages 0-9, 1 for ages 10-19, etc.