Question

I have table design like this:

id_a    int(10) NO  PRI     
id_b    int(10) NO  PRI     

For example: I want to delete data pair where one column contains ‘1’ and second contains ‘2’.
but there are two possibilities:

1) id_a = 1, id_b = 2
2) id_a = 2, id_b = 1

And I newer know if ‘1’ will be in column id_a or id_b.
What is the best way to handle deletes like this?.

Answer 1

Just look for both:

WHERE (id_a = 1 AND id_b = 2) 
   OR (id_a = 2 AND id_b = 1)