sql - how to combine two columns of integer in PostgreSQL? -


i have following query: 

select col1, col2 ... where...

which gives:

col1  col2 5        17 4       5 12 5        20 4      17 2       3

i want convert 1 column no duplicates follows:

col3 5 17 4 12 20 2 3

how can that? read topic combine 2 columns , add 1 new column it's not need... operator || won't here.

edit: col3 list of numbers appear in col2 , col1.

it seems need union

select col1 col3 t col1 not null union select col2 col3 t col2 not null

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