Question

I have a table

A

name    num
------------
A        1
B        0
C        3

B

num      marks
---------------
1        90
3        40

Query: ??

Result:

name    marks
--------------
A        90
C        40
B        90
B        40

So number “0” in table A corresponds to all num column values. Is there a way this query can be written

I know to get this

name    marks
--------------
A       90
C       40 

we can do this

select A.name, B.marks from A,B where A.num = B.num;

Edit: In this case 0 maps to num values 1 and 3

Answer 1

How about:

SELECT A.name, B.marks FROM A, B WHERE A.num = 0 OR A.num = B.num