Question

For example, let’s say I have the following two tables:

Table1:

Id
----
1
2

Table2:

Month
------
Jan
Feb

And I want to combine them using an SQL query to form the following output:

Id        Month
----      -------
1         Jan
1         Feb
2         Jan
2         Feb

Is there a way to do this using a single query?

Answer 1

The correct answer is “cross join”:

select *
from t1 cross join j2

There is no “on” clause for a cross join. You can do the same thing just using a comma, but this is ancient (and hopefully one day deprecated) SQL syntax. The cross join is the right way to go.