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with t (col1,col2) as (values ('V1,V2,V3,V4,V5,V6','V4,V1,V6'), ('V1,V2,V3','V2,V3') ) select col1,col2 , ( select string_agg(v,',') from ( select v from unnest(string_to_array(t.col1,',')) as a1(v) except select v from unnest(string_to_array(t.col2,',')) as a2(v) ) x ) from t
col1
col2
string_agg
V1,V2,V3,V4,V5,V6
V4,V1,V6
V3,V2,V5
V1,V2,V3
V2,V3
V1