Question

I want to get values from two tables like in the following example:

Suppose we have this two tables:

TableA (with link to tableB):

Id | Id_TableB | Name
---------------------
1  |   1       |  Ralf
2  |   NULL    | Marta

TableB:

Id |  Color
---------------------
1  |  Blue
2  |  Red

I would like to get values for Color if there is a link, NULL otherwise:

Result:

Id |   Name | Color
-----------------------------
1  |    Ralf| Blue
2  |   Marta| NULL

Any ideas on how to solve this?

Answer 1

You need a left outer join .

SELECT t1.Id, t1.Name, t2.Color 
from TableA t1 left outer join TableB t2 
on t1.Id_TableB = t2.Id;

Please check the link that I have provided above. Its a simplified tutorial