Question

I have two tables (A and B) with two columns in common (x and y). I’d like to inner join A and B on x but keep only the values of A’s column y (the left join). I’m looking for a way that will combine the two y columns (can’t just specify A.y in the select statement). How can I do this?

Example

Table A

x  y
1  2
3  4
5  6
7  8

Table B

x  y
1  2
3  8
9  null
11 0

I’d like the resulting table to look like

x  y
1  2
3  4

Answer 1

select a.x, a.y
from TableA a
inner join TableB b on a.x = b.x