Insert multiple rows from two tables into one table

Question

I have two tables with a number of rows in each. I want to "merge" these two into another table, how would I go about and do that?

I've tried INSERT INTO SELECT , but it's not doing what I want (or maybe I'm possibly doing it wrong).

The Tables I have are:

Versions
  [version] VARCHAR(10)

Semesters
  [id] INT
  [semester] INT
  [name] VARCHAR(150)

Versions_semesters
  [semesterid] INT
  [version] VARCHAR(10)

Some example data from Versions and Semesters:

Versions
  'Version1.0'
  'Version1.5'

Semesters
  1, 15, 'Autumn15'
  2, 15, 'Spring15'
  3, 15, 'Fall15'
  4, 16, 'Autumn16'
  5, 16, 'Spring16'
  6, 16, 'Fall16'

What I'd want to achieve is a table holding versions related to semesterIDs.

I can get the subsets I want by doing the following:

SELECT id FROM semesters WHERE semester = 16;
SELECT * from Versions;

And these two subsets I'd like to INSERT INTO Versions_semesters so it looks like this:

Versions_semesters
  4, 'Version1.0'
  5, 'Version1.0'
  6, 'Version1.0'
  4, 'Version1.5'
  5, 'Version1.5'
  6, 'Version1.5'

Anyone have an elegant (or ugly) solution to this? I guess a CROSS JOIN could be used as I have the subsets extracted, but how do I do both get the subsets and then Join them?

Answer 1

You are looking for a CROSS JOIN which is the Cartesian product of the two tables.

INSERT INTO Table3
(ID,Version)
SELECT Id,Version
FROM Table1 CROSS JOIN Table2