Ben Clewett wrote:
> Unfortunately I get:
>
> mysql> SELECT
> ->
> c.table_schema,u.table_name,u.column_name,u.referenced_column_name
> -> FROM information_schema.table_constraints AS c
> -> INNER JOIN information_schema.key_column_usage AS u
> -> USING( constraint_schema, constraint_name )
> -> WHERE c.constraint_type = 'FOREIGN KEY'
> -> AND u.referenced_table_schema='db'
> -> AND u.referenced_table_name = 'table'
> -> ORDER BY c.table_schema,u.table_name;
>
> Empty set (27.86 sec)
Indeed, you didn't substitute your 'db' and 'table' values.
PB
-----
>
> mysql> SELECT version();
> +-----------------+
> | version() |
> +-----------------+
> | 5.1.6-alpha-log |
> +-----------------+
>
> But thanks, I think I can work with this and get the information I want.
>
> Regards,
>
> Ben.
>
>
> Peter Brawley wrote:
>> Ben,:
>>> Dear MySQL,
>>>
>>> Can you please tell me if there is a way of listing all child tables
>>> which have a foreign key reference to a parent?
>> Find children of db.table:
>>
>> SELECT
>> c.table_schema,u.table_name,u.column_name,u.referenced_column_name
>> FROM information_schema.table_constraints AS c
>> INNER JOIN information_schema.key_column_usage AS u
>> USING( constraint_schema, constraint_name )
>> WHERE c.constraint_type = 'FOREIGN KEY'
>> AND u.referenced_table_schema='db'
>> AND u.referenced_table_name = 'table'
>> ORDER BY c.table_schema,u.table_name;
>>
>> PB
>>
>> -----
>>
>>>
>>> Therefore I can find and delete a child row, then delete the parent
>>> without getting:
>>>
>>> "a foreign key constraint fails"
>>>
>>> Regards,
>>>
>>> Ben Clewett
>>>
>>
>>
>
>
>
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