1.并集(UNION/UNION ALL) Oracle&SQLServer中用法一致 UNION 去重 UNION ALL 不去重 -- 去重 select * from tablea union select * from tableb -- 不去重 select * from tablea union all select * from tableb 2.交集(INTERSECT/EXISTS) Oracle&SQLServer中用法一致 INTERSECT 去重 EXISTS 不去
小白一枚,python解法,共同学习,一起进步. Problem 1: Multiples of 3 and 5 If we list all the natural numbers below 10 that are multiples of 3 or 5, we get 3, 5, 6 and 9. The sum of these multiples is 23. Find the sum of all the multiples of 3 or 5 below 1000. 解题思路: 找
转自:http://www.maomao365.com/?p=7205 摘要: 下文分享两条sql求和脚本,再次求和的方法分享 /* 例: 下文已知两条sql求和脚本,现需对两张不同表的求和记录再次求和 */ ---对两条求和sql脚本求和的方法 select sum(q) from ( select sum(qty) as q from tableNameA where ... union all select sum(qty) as q from tableNameB where ... )
w SELECT COUNT(*) FROM ( SELECT COUNT(*) FROM listing_vary_asins GROUP BY asin, countrycode ) AS w; SELECT COUNT(*) FROM listing_vary_asins GROUP BY asin, countrycode; 分类 统计 去重 SELECT MIN(id) as min_id ,COUNT(1) AS c FROM parent_url_copy GROUP BY
,[emp_name] ,[gender] ,[department] ,[salary] from [employee] select * from ( select ROW_NUMBER() over(partition by emp_id order by emp_id) empid ,* from [employee]) as tb delete tb from (select ROW_NUMBER() over(partition by emp_id order by emp_id)
找出所有不重复的数据 SELECT [Id] ,[Name] ,[Mobile] ,[City] ,[Counter] ,[utm_source] ,[utm_medium] ,[utm_campaign] ,[source] ,[smsResponse] ,[CreateTime] FROM [dbo].[Campaigns] where id in (select max(ID) as Id from [Campaigns] group by [Mobile])