SQL - 将每个值添加到表中的每个其他值

Question

I have a sample table

table
2
4
6

I want to add each value to every other value in this manner:

table
(2+2)
(2+4)
(2+6)
(4+2)
(4+4)
(4+6)
(6+2)
(6+4)
(6+6)

The end result should look like:

table
4 
6 
8 
6 
8 
10
8 
10
12

But I have no idea on how to calculate all the values in this manner.

Answer 1

Do a self CROSS JOIN to get a cross product:

select t1.c + t2.c
from tablename t1 cross join tablename t2

Add ORDER BY if you need to guarantee that specific order:

ORDER BY t1.c, t2.c