Question

I want to compare two tables that has the same columns but different number of rows. How do I find which rows are unique to each table? I found some join tutorials but it needs primary key to join two tables, my sample tables have no relation to each other.

Sample table:

TableA
Id | Name
1 | Person1
2 | Person2
3 | Person3
4 | Person4

TableB
Id | Name
1 | Person1
2 | Person2
4 | Person4

Sample result:
Id | Name
3 | Person3

Optional result:
Id | Name | Table
3 | Person3 | TableA

Answer 1

This query selects rows from TableA that are not present in TableB plus the rows from TableB not present in TableA, using a UNION statement.

SELECT Id, Name, 'TableA' FROM TableA
WHERE (Id, Name) NOT IN
(SELECT Id, Name FROM TableB)
UNION
SELECT Id, Name, 'TableB' FROM TableB
WHERE (Id, Name) NOT IN
(SELECT Id, Name FROM TableA)