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CREATE TABLE tab1( st_dt date, end_dt date); INSERT INTO tab1 (st_dt, end_dt) VALUES (TO_DATE('2022-08-01', 'YYYY-MM-DD'), TO_DATE('2022-08-05', 'YYYY-MM-DD')), (TO_DATE('2022-08-06', 'YYYY-MM-DD'), TO_DATE('2022-08-15', 'YYYY-MM-DD')), (TO_DATE('2022-08-20', 'YYYY-MM-DD'), TO_DATE('2022-08-25', 'YYYY-MM-DD')), (TO_DATE('2022-08-28', 'YYYY-MM-DD'), TO_DATE('2022-08-30', 'YYYY-MM-DD')); Select * FROM tab1; SELECT *, extract(day from next_dt) - extract(day from end_dt) AS days_diff FROM (SELECT *, LEAD (st_dt, 1) OVER (ORDER BY st_dt) AS next_dt FROM tab1 ) AS subquery_alias

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