JOINING multiple tables to a single parent table

Question

I am trying to join the data from three different tables into a single view in SQL. The relationship is as follows Parent -> Child 1 and Parent -> Child 2. Child 1 and Child 2 do not have any relationship among them. (See image below)

I tried using a left join and it ends up in the relationship Parent -> Child 1 -> Child 2.

Answer 1

Are you sure you are joining child2 to the parent table?

SELECT *
FROM Parent p 
JOIN Child1 c1 on p.colA = c1.colA
JOIN Child2 c2 on p.colB = c2.colB

Answer 2

The idea is the following and depending which set you are after you change the joins ( left, inner, right in combination with where clauses eg WHERE c2.b is null). It would be much better to display sample data and desire output instead of a generic venn.

 select * from Parent P
 left join Child1 c1
 on p.A=c1.A
 left join Child2 c2
 on p.B=c2.B