sql - How to select rows using outer join -

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i have 2 a1 , a2 tables wit single column.

a    b -    - 1    3 2    4 3    5 4    6

i need select records not in b. tried select [a1] left outer join a2 c on a.[a]=c.[b] select 1 , 2 more 1 time, want unique results only, want 1 , 2 only. refereed few links outer join not able understand fully. know silly question new joins.

what not in combined distinct you're not getting duplicates

select distinct a1 not in (select b a2)

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