Question

I can’t seem to get the SQL to work when using LIKE

DELETE FROM `customer_numbers` 
WHERE number NOT LIKE (SELECT number FROM number_part)%

Basically delete all the rows from constomer_numbers table if number does not contain in number_part table

Example:
customer_numbers.number = 0559354544 and number_part.number = 05593 – it shouldn’t delete it.. However if 05593 does not contain in customer_numbers.number then delete row from customer_numbers table.. It should match first 5 digits from number_part

Answer 1

You can’t use not like with a list (in most databases, I’m pretty sure this is true in mysql).

Instead, you can use a correlated subquery:

DELETE FROM `customer_numbers`
WHERE not exists (SELECT number FROM number_part
                  where customer_numbers.number like concat(number, '%')
                 )