Question

If I have two tables:

Temp           Snow
--------       -------------
School         School   Skip
--------       -------------
School 1       School 1    1
School 2       School 4    0
School 3       School 3    1

And I want to see if a 0 is present in the Skip column of table Snow, is it possible to just in the rows that contain the same School value? In this case, it would just search for a 0 in the School 3 and School 1 rows, because the School name matches up with the one from Temp.

Currently, I am using the following, but it’s including every row:

SELECT Skip FROM Snow WHERE Skip = 0

Answer 1

You just need to join both tables. As you can see there are letters after the table names. They are called ALIASes (nickname) of the tables.

SELECT  a.School
FROM    Snow a
        INNER JOIN Temp b
            ON a.School = b.School
WHERE   a.skip = 0

SQLFiddle Demo