ms sqlserver常用sql语句

-- 获取SqlServer中表结构 SELECT syscolumns.name,systypes.name,syscolumns.isnullable, syscolumns.length FROM syscolumns,systypes WHERE syscolumns.xusertype = systypes.xusertype AND syscolumns.id = object_id ( ' 你的表名 ' ) -- 单独查询表递 -- 获取SqlServer中表结构 SELECT syscolumns.name,systypes.name,syscolumns.isnullable,syscolumns.length FROM syscolumns, systypes WHERE syscolumns.xusertype = systypes.xusertype AND syscolumns.id = object_id('你的表名') -- 单独查询表递增字段select [name] from syscolumns where id=object_id(N'你的表名') and COLUMNPROPERTY(id,name,'IsIdentity')=1 -- 获取表主外键约束exec sp_helpconstraint '你的表名' -- 自定义函数递归调用此方法适用于无限级分类情况下取出所有的父分类数据CREATE function sp_GetAllParentByClassID( @classID int --参数)returns varchar(500)asbegindeclare @ParentClassID varchar(15) --变量父IDdeclare @result varchar(500) --变量@resultset @result = '' --首先根据传入的ClassID获取其父ID，ParentClassID SELECT @ParentClassID = ParentClassID FROM tClass where ClassID = @classIDif (@ParentClassID 0)--如果不是根节点begin -- 再将@ParentClassID父ID作为ClassID传入 进行自调用 set @result = dbo.sp_GetAllParentByClassID(@ParentClassID) + @ParentClassID+'_' end return @resultend有的SQL版本运行上述SQL语句在dbo.sp_GetAllParentByClassID(@ParentClassID)会报错。原因是，此时正的创建dbo.sp_GetAllParentByClassID函数，而还未创建，在又在此处调用dbo.sp_GetAllParentByClassID(@ParentClassID)，因此会提示没有这个对象，解决办法是先去掉dbo.sp_GetAllParentByClassID(@ParentClassID)创建后再Alter修改 即可！ -- 如何将exec执行结果放入变量 num 中(自定义sql语句传出参数) declare @num int, @sqls nvarchar(4000) set @sqls='select @a=count(*) from tableName ' exec sp_executesql @sqls,N'@a int output',@num output select @num --------------统计类-------------SELECT ZIP FROM CustomersWHEREState = ''KY'' GROUP BY ALL ZIPSELECT ZIP FROM CustomersWHEREState = ''KY'' GROUP BY ZIPSELECT ZIP, Count(ZIP) AS CustomersByZIP FROM Customers GROUP BY ZIP HAVING Count(ZIP) = 1SELECT OrderID, Sum(Cost * Quantity) AS OrderTotal FROM Orders GROUP BY OrderIDSELECT Customer, OrderNumber, Sum(Cost * Quantity) AS OrderTotal FROM Orders GROUP BY Customer, OrderNumber WITH ROLLUPSELECT Customer, OrderNumber, Sum(Cost * Quantity) AS OrderTotal FROM Orders GROUP BY Customer, OrderNumber WITH CUBE-----------------------------------当CUBE的结果令人迷惑时（它经常是这样），可以添加一个GROUPING函数，如下所示： SELECT GROUPING(Customer), OrderNumber, Sum(Cost * Quantity) AS OrderTotal FROM Orders GROUP BY Customer, OrderNumber WITH CUBE 结果中每行包含两个额外的值： 值1表示左边的值是一个统计值，是ROLLUP或CUBE的操作符。 值0表示左边的值是一条由最初的GROUP BY语句产生的详细记录。----------------SELECT region, SUM(population), SUM(area)FROM bbc GROUP BY region HAVING SUM(area)>1000000-------------------------------------Select 课程名, [成绩>=85]=SUM(Case When 成绩>=85 Then 1 Else 0 End) , [85>成绩>70]=SUM(Case When 成绩>=70 And 成绩 [成绩 总人数=Count(1) from TableName Group By 课程名 Order By 课程名----------------分组分段统计-----------------------select t.fromaccountid, onglogtimes=sum(case when t.logtimes1>0 then 1 else 0 end), twologtimes=sum(case when t.logtimes2=2 then 1 else 0 end), regnum =sum(t.regStatus), t.regdatefrom(select a.fromaccountid, count(1) as logtimes1, --当日有登录记录的统计 sum(case when datediff(mm,regdate,datetime)=0 then 1 else 0 end) as logtimes2, --在注册当月登录的统计 max(case when datediff(dd,regdate,datetime)=0 then 1 else 0 end) as regStatus, --当日为注册操作的统计 convert(char(10),a.regdate,120) as regdate from vgameuser a,loginlog b where a.accountid=b.playerid group by a.fromaccountid,convert(char(10),a.regdate,120))tgroup by t.fromaccountid,t.regdate--------------------------