SQL Column compare in the same table (self-join) -

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i need hint in order solve sql (self-join) problem:

a table, columns value , category 

 id    ||  value || category || foo ------------------------------------  1     ||  1     ||        || 1  2     ||  2     ||        || 4  3     ||  3     ||        || 2  4     ||  0     || b        || 2  5     ||  1     || b        || 1  6     ||  2     || b        || 4  7     ||  3     || b        || 2  8     ||  4     || b        || 2  9     ||  5     || b        || 1 10     ||  5     || b        || 4 11     ||  6     || b        || 2 12     || 99     || z        || 2

i compare values category b , values category a , values in b , not in a or id, so:

(0,1,2,3,4,5,5,6) "compare" (1,2,3) => (0,4,5,5,6)

ansi sql:

select * tbl category = 'b' , value not in (select value tbl category = 'a')

see live here.


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