Having works on the result table, not the source tables.
Since you did not select cnt, having can not examine it.
Maybe you ment 'where' instead of 'having' ?
\"Piotr Gapinski\" wrote:
>
> small problems with query below...
> my fault?
>
> mysql> desc poll_answer;
> +---------+-------------+------+-----+---------+-------+
> | Field | Type |Null | Key | Default | Extra |
> +---------+-------------+------+-----+---------+-------+
> | poll_id | int(10) | | | 0 | |
> | cnt | int(10) | | | 0 | |
> | answer | varchar(60) | | | | |
> +---------+-------------+------+-----+---------+-------+
> 3 rows in set (0.00 sec)
>
> mysql> select answer from poll_answer having cnt=1;
> ERROR 1054: Unknown column 'cnt' in 'having clause'
>
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