Question

I have a MySQL query that looks something like this:

SELECT column1_value, column2_value 
  FROM some_table
 WHERE column2_value IN (a,lot,of,comma,separated,values)
   AND column1_value NOT IN (SELECT column1_value, 
                                    column3_value 
                               FROM some_table 
                              WHERE column3_value = some_number)
ORDER BY something DESC
LIMIT 4

But i keep getting an error, what is wrong?

Can’t i do IN and then NOT IN?

Thanks in advance

Answer 1

The problem is this line

AND column1_value NOT IN (SELECT column1_value, 
                                column3_value 
                           FROM some_table 
                          WHERE column3_value = some_number)

Notice the inner subquery?

SELECT column1_value, column3_value 
FROM some_table 
WHERE column3_value = some_number

You are returning two columns in the data-set! It should just be

SELECT column1_value 
FROM some_table 
WHERE column3_value = some_number

Or whatever (single!) column you want to test against.