Question

I have a table in SQL Server 2008 with columns serial, ida, idb, and remark.

Example data :

serial   ida      idb      remark
1        3        4        null
2        3        6        null
3        3        7        null
4        2        3        null
5        4        7        null
6        4        6        null

I want to select the common idb from ida 3 and 4. I am confused here how to write the SQL query for this.

A little help will be appreciated.

Answer 1

Select idb from mytable
Where ida = 3
intersect
Select idb from mytable
Where ida = 4