标签：des style blog io color ar sp 数据 div
【SQL】 常用语句
INSERT INTO Table2(field1,field2,...) SELECT value1,value2,... FROMTable1
要求目标表Table2必须存在
2.批量导入
SELECT vale1, value2 INTO Table2 FROM Table1
要求目标表Table2不存在，因为在插入时会自动创建表Table2，并将Table1中指定字段数据复制到Table2中
3.去重并保留一项
DELETE FROM tableName WHERE Id in (select MIN(id) FROM tableName GROUP BY colName HAVING COUNT(colName) > 1)
4.批量更新
UPDATE t1 SET Field1 = Field21, Field2 = Field22 FROM Table2 t2 WHERE ((t2.Field24 >= ‘‘) AND t1.fId = t4.fId);
6.分页
--max/top SELECT TOP 50 * FROM pagetest WHERE id>(SELECT MAX(id) FROM (SELECT TOP 9900 id FROM pagetest ORDER BY id)a) ORDER BY id --row_number() SELECT * FROM (SELECT ROW_NUMBER()OVER(ORDER BY id)rownumber,* FROM pagetest)a WHERE rownumber>=9901 and rownumber<=9952
7. 表同步 MERGE
MERGE into [MergeDemo] as m -- 目标表 using Test as t -- 源表 on m.[title]=t.[name] -- 匹配条件 when matched then update set m.[num]=t.[age] -- 匹配成功 when not matched then insert values(t.[name],t.[age]) -- 目标表与源表不一致 when not matched by source then delete -- 源表与目标表不一致 output $action as [action] -- 输出操作 , inserted.[title] [ititle],inserted.[num] [inum] , deleted.[title] [dtitle],deleted.[num] [dnum];
8. GROUP 加 TOP（每个 GROUP 取出 TOP 数据）
Declare @currentIndex int -- 游标 Declare @totalRows int -- 总的组数 Declare @time nvarchar(20) -- 第一个分组列 SET @currentIndex=1 -- 按 第一个分组列 分组， 取出组名 SELECT row_number()over(order by [time] asc) id,[time] INTO #temp1 FROM (SELECT DISTINCT(CONVERT(VARCHAR(10),create_time,120)) [time] FROM tableName) a SELECT @totalRows=COUNT(1) FROM #temp1 -- 总的组数 WHILE @currentIndex<=@totalRows -- 按 组名 循环 BEGIN SELECT @time=[time] FROM #temp1 WHERE id=@currentIndex -- 取出当前组名 -- 取出当前 组 拥有的数据， 再按照 第二分组列 分组 取 TOP SELECT TOP 20 colName ‘Url‘, COUNT((colName)) ‘Count‘,CONVERT(VARCHAR(10),create_time,120) ‘Time‘,GETDATE() FROM tableName WHERE [time] = @time GROUP BY colName ORDER BY COUNT((colName)) DESC SET @currentIndex =@currentIndex+1 END
标签：des style blog io color ar sp 数据 div
原文地址：http://www.cnblogs.com/fzz2727551894/p/4101574.html
