在我的产品表中,我有14种产品,对于每种产品,我需要在美国的每个州都有一排。我试图通过以下方式实现这一目标:
begin tran
declare @state varchar(2),
@productId int
declare stateCursor CURSOR FOR
select distinct [State]
from lookUpAreaFactor
declare productCursor CURSOR FOR
select distinct productid
from Product
open stateCursor
open productCursor
FETCH NEXT from stateCursor into @state
fetch next from productCursor into @productId
while @@FETCH_STATUS = 0
BEGIN
while @@FETCH_STATUS = 0
BEGIN
insert into ProductToState (ProductID,[State]) values (@productId,@state)
fetch next from productCursor into @productId
END
fetch next from stateCursor into @state
END
close stateCursor
close productCursor
select * from producttostate
rollback
它是在第一个产品之后轰炸 - 但它甚至没有为所有50个州插入一排。我可以用另一双眼睛 - 我在这里做错了什么?
答案 0 :(得分:5)
为什么使用游标进行基于集合的操作?
我认为此查询可以满足您的需求:
insert into ProductToState(ProductID, [State])
select ProductId, State
from (select distinct [State] from lookUpAreaFactor) s cross join
(select distinct ProductId from Product) p;
答案 1 :(得分:1)
你需要使用游标吗?如果不这样做,您可以使用简单的交叉连接
INSERT INTO ProductToState
( [STATE], productid )
SELECT DISTINCT s.[State], p.productid
FROM products p CROSS JOIN lookUpAreaFactor s