Victor Sp?ng Arthursson <[EMAIL PROTECTED]> wrote:
>
> Using mysql version 4.0.x, and would like to know if it is possible to
> join in a count(*) from a related table which count the number of
> corresponding posts in this per post in the first table?
>
> A little like:
>
> table1:
> +-------------+----------+
> | id | name |
> +-------------+----------+
> | 04002 | victor |
> +-------------+----------+
> | 04003 | pierre |
> +-------------+----------+
>
> table2
>
> +-------------+----------+
> | id | relid |
> +-------------+----------+
> | 1 | 04002 |
> +-------------+----------+
> | 2 | 04002 |
> +-------------+----------+
> | 3 | 04002 |
> +-------------+----------+
> | 4 | 04003 |
> +-------------+----------+
>
> The result I want is:
> +-------------+----------+
> | id | count(*) |
> +-------------+----------+
> | 04002 | 3 |
> +-------------+----------+
> | 04003 | 1 |
> +-------------+----------+
>
> Is this possible?
>
Sure.
SELECT relid, count(*) from table1, table2 WHERE table1.id=table2.relid GROUP
BY relid;
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