sql-leetcode Consecutive Numbers
開始想 用 group 把Num都聚在一起
-- Group By語句從英文的字面意義上理解就是“根據(by)一定的規則進行分組(Group)”。
--它的作用是通過一定的規則將一個數據集劃分成若幹個小的區域,然後針對若幹個小區域進行數據處理。但是group by是先排序後分組;
每個部門有多少人:
select DepartmentId as ‘部門名稱‘, count(*) as ‘個數‘ from basicDepartment group by DepartmentId
所以不能使用group by ,將表復制3份進行比較:
select(Select DISTINCT l1.Num from Logs l1, Logs l2, Logs l3 where l1.Id=l2.Id-1 and l2.Id=l3.Id-1 and l1.Num=l2.Num and l2.Num=l3.Num) as ConsecutiveNums;
sql-leetcode Consecutive Numbers
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