Question

I have an sql query like this

Select col1, (select abc from table2 where def=1) as col2
From Table1 inner join table3 on Table1.id = table3.id
Where col2 = 4

The problem is that the where condition doesn’t work. I get an error saying

Invalid column name ‘col2’

Kindly help me fix this sql query.

Thanks in advance

Answer 1

You can define it in a CROSS APPLY and then reference in the SELECT and WHERE

SELECT col1,
       col2
FROM   Table1
       INNER JOIN table3
         ON Table1.id = table3.id
       CROSS APPLY (SELECT abc
                    FROM   table2
                    WHERE  def = 1) C(col2)
WHERE  col2 = 4