php - In some way to calculate the number of entries in tags? -

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tags:

id, name --------- 1   tag1 2   tag2 3   tag3  4   tag4

tags_id:

id_tags, id_post -------------- 1          1     2          3     3          1    4          2

how count how many posts tags?

i need mysql query..

i have problem , i'm beginner

select id_tags, count(id_post) id_post_count  tags_id  group id_tags

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