oracle - SQL Query - aliasing + different periods + different tables -


i using toad oracle , experienced different issues.

aliasing - when want use same column twice?!
let asume have table x has col1, col2, col3. col1 contains customer contact numbers (211,212,213, , more)

and there table, y, has col1,col4,col5. col1 in both tables equal. col4 shows whether number main or secondary.

table y

(col1,col4,col5) (211,main,v) (212,secondary,s) (213,secondary,w)

what want follow :

select col2, col1 mainnumbet, col1 secondnumber   x  mainnumber in (select col1                          y                         col4 = 'main')    , secondnumber in (select col1                            y                           col4 = "secondary")

but states there problem !??

there several problems code.

perhaps want:

select x.col2,         case when col4 ='main'      x.col1 end mainnumber,        case when col4 ='secondary' x.col1 end secondnumber,  x   join y     on x.col1 = y.col1

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