Is there a SQL function to expand table?

Question

I vaguely remember there being a function that does this, but I think I may be going crazy.

Say I have a datatable, call it table1. It has three columns: column

Answer 1

if you want a cartesian product (all the combination on a row ) you could use

SELECT a.*, b.*, c.* 
FROM table1 a
CROSS JOIN table1 b
CROSS JOIN table1 c

if you want the same rows repeated you can use UNION ALL

SELECT *
FROM table1 
UNION ALL 
SELECT *
FROM table1 
UNION ALL 
SELECT *
FROM table1