取所有月份: declare @begin datetime,@end datetime set @begin='2015-2-6' set @end='2015-12-2' declare @months int set @months=DATEDIFF(month,@begin,@end) select convert(varchar(7),DATEADD(month,number,@begin) ,120) AS 月份 from master.dbo.spt_values where ty
SELECT MAX(b.a) from ( select distinct * from (values (1), (1), (1), (2), (5), (1), (6)) as Y(a) ) as b SELECT MAX(b.b) from ( select distinct * from (values (1,2), (1,3), (1,4), (2,5), (5,6), (1,7), (6,8)) as Y(a,b) ) as b SELECT MAX(b.c) from ( sel
create table test (id int, name ), score int, classname )); ,,'一班'); ,,'一班'); ,,'一班'); ,,'二班'); ,,'二班'); ,,'二班'); select t.* from (select test.*,row_number() over (partition by classname order by score desc) rn from test) t ;
在sql server中,取数据中前10条语句,我们可以用top 10 这样语句,但是oracle就没有这个函数,接下来介绍它们之间的区别 1.sql server 取前10语句和随机10条的语法 --测试表数据-- select * from BdsPaperItem --查询测试表的前10条语句-- * from BdsPaperItem order by Uid asc --随机查询测试表10条语句-- * from BdsPaperItem order by NEWID() 结果实例:
--聚合函数 use pubs go select avg(distinct搜索 price) --算平均数 from titles where type='business' go use pubs go select max(ytd_sales) --最大数 from titles go use pubs go select min(ytd_sales) --最小数 from titles go use pubs go select type,sum(price),sum(advance)