Question

Is this supposed to count the appearances of each link_id on the table?

SELECT link_id, count(*) FROM table group by link_id

I think it should, but if I just execute

SELECT * FROM table

I get different results. For example, for link 7 I get a count of 40 in the first query, but using ‘select *’ i see that there are only 4 rows of link 7… What’s going on?

Answer 1

Yes it is supposed to do that,

Surely it would be easier to do a

SELECT DISTINCT count(link_id) FROM table

This would give you a single row containing the amount of link_id’s

Alternatively

SELECT link_id,count(*) FROM table GROUP BY link_id's

Returns multiple rows containing the count of each

With regard to the original question you mention there are multiple rows per id, are you doing a join any where?

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I get different results. For example, for link 7 I get a count of 40 in the first query, but using ‘select *’ i see that there are only 4 rows of link 7… What’s going on?

Are you sure phpMyAdmin or similar isn’t limiting the amount of rows you are seeing?