यदि आप PostgreSQL 8.4 का उपयोग कर सकते हैं तो विंडो फ़ंक्शन मदद करेगा:
SELECT *
FROM (SELECT itemName, date, date - lag(date) OVER w AS gap
FROM someTable WINDOW w AS (ORDER BY date)
) AS pairs
WHERE pairs.gap > '1 day'::interval;