sql - Select data that exists in A but not in B -

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imagine have tables: this tables.

what need data exists in not in b, in case select have return "2".

i've done before, right know can't remember how. suppose this:

select a.* left join b b on b.column = a.column

but it's not working. can me, please?

thanks in advance.

you're missing filter:

select a.* left join b b on b.column = a.column b.column null

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