use northwind
go
select productid,sum(quantity) as [total_quantity] from [order details]
group by productid
order by productid
go
select * from [order details]
go
select productid,sum(quantity) as [total_quantity] from [order details]
where productid=2
group by productid
go
select productid,quantity from [order details]
where productid=2
go
select productid,sum(quantity) from [order details]
group by productid
having productid>=60
go
--group相当于where，select和where的关系相当于group by和having的关系
select productid,sum(quantity) from (select productid,quantity from [order details]
where quantity>=60) as T
group by productid
go
select productid,orderid,sum(quantity) as [total_quantity] from [order details]
group by productid,orderid
with rollup
go
select productid,orderid,quantity from [order details]
order by productid,orderid --必须有这行，不然compute by 不起作用
compute sum(quantity) by productid
compute sum(quantity)
go
select productid,sum(quantity) as [total_quantity] from [order details]
group by productid
order by productid
go
