Re: Delete performance

Frank Bax wrote:
> Jana wrote:
>>
>> Hello,
>> i have a table with about 250m records from which i want to delete
>> thoose not contained in other table. I used this SQL query:
>> DELETE FROM data_structures_items WHERE id_data_structure NOT IN (
>> SELECT id_structure FROM data_structures);
>
>
> DELETE FROM data_structures_items, data_structures WHERE
> data_structures_items.id_data_structure =
> data_structures.id_data_structure AND
> data_structures_items.id_data_structure IS NULL;
>

Sorry; that should probably be:

DELETE FROM data_structures_items, data_structures WHERE
data_structures_items.id_data_structure =
data_structures.id_data_structure AND
data_structures.id_data_structure IS NULL;