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with table1 as ( select 1 as PersonId, 2 as CoupleId from dual union all select 2, 1 from dual union all select 3, null from dual union all select 4, 5 from dual union all select 5, 4 from dual union all select 4, 5 from dual union all select 2, 1 from dual ) select count(*) as qnt from ( select count(*) as qnt from table1 group by case when PersonId < CoupleId then PersonId else CoupleId end, case when PersonId < CoupleId then CoupleId else PersonId end having count(*) > 1 );
QNT
2
with table1 as ( select 1 as PersonId, 2 as CoupleId from dual union all select 2, 1 from dual union all select 3, null from dual union all select 4, 5 from dual union all select 5, 4 from dual union all select 4, 5 from dual union all select 2, 1 from dual ) select count(count(*)) over () as qnt from table1 group by case when PersonId < CoupleId then PersonId else CoupleId end, case when PersonId < CoupleId then CoupleId else PersonId end having count(*) > 1 order by qnt fetch first 1 row only;
QNT
2