連續出現的數字
阿新 • • 發佈:2019-05-06
col bsp 三次 class 出現 rom style tinc 數字
編寫一個 SQL 查詢,查找所有至少連續出現三次的數字。
+----+-----+ | Id | Num | +----+-----+ | 1 | 1 | | 2 | 1 | | 3 | 1 | | 4 | 2 | | 5 | 1 | | 6 | 2 | | 7 | 2 | +----+-----+
例如,給定上面的 Logs
表, 1
是唯一連續出現至少三次的數字。
+-----------------+ | ConsecutiveNums | +-----------------+ | 1 | +-----------------+
select Num as ConsecutiveNums from Logs where Id in ( select distinct l1.Id from Logs l1,Logs l2,Logs l3 where (l1.Num = l2.Num and l2.Num = l3.Num and ( (l1.Id + 1= l2.Id and l2.Id +1 = l3.Id)or (l3.Id + 1= l2.Id and l2.Id +1 = l1.Id)or (l3.Id + 1= l1.Id and l1.Id +1= l2.Id) ) ) order by l1.Id) group by Num
連續出現的數字