Question

I have a query which contains a select statement in it’s where clause. My question is now, how can I access the parent’s select‘s data.

Example:

select * from TABLE_1 as t1 INNER JOIN TABLE_2 as t2
where (... and ...) OR 
      (not exists(select * from TABLE_3 as t3 
                                inner join TABLE_1 ON t3.t1_id = t1.id

The last line is where the error occurs: t1.id is not a column.

How can I access the current value from the table t1?
I’m using MySql 5.1

Answer 1

SELECT
  *
FROM
  TABLE_1 as t1 
  INNER JOIN TABLE_2 as t2 ON
    t2.PK = t1.FK --Whatever your keys are
WHERE
  (... and ...)
  OR
  (
  NOT EXISTS (select * from TABLE_3 as t3 WHERE t3.t1_id = t1.id)
  )