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with tbl as ( SELECT 1 as id from dual union all SELECT 2 as id from dual union all SELECT 3 as id from dual union all SELECT 4 as id from dual union all SELECT 5 as id from dual union all SELECT 7 as id from dual union all SELECT 10 as id from dual ) SELECT DISTINCT a.id+1 FROM tbl a LEFT OUTER JOIN tbl b ON b.id = a.id+1 WHERE b.id IS NULL;
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