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create function all_pairs(v text) returns bool as $$ with counts as ( select count(*) as c from unnest(string_to_array(v, ' ')) as vals(val) group by val ), arr as ( select array_agg(c) as cc from counts ) select 2 = all(cc) from arr $$ language sql
CREATE FUNCTION
with values as ( select '1 1 2 2' as v union all select '100 10 10 100' union all select 'A B B A' union all select 'HELLO HELLO' union all select 'hello hello hello' union all select '1 1 22' union all select '1001' ) select * from values where all_pairs(v)
v
1 1 2 2
100 10 10 100
A B B A
HELLO HELLO
SELECT 4