Peter,
I see... I was thinking 'db' might have been a system table name or
something...
This works perfectly, thanks.
Ben
Peter Brawley wrote:
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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