>My nephew asked for some help on a query and so far I can't seem to think of a good way to do it. Here is his question.
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>A one-to-many relationship where the parent table is a list of customers and the child table is a list of things they've bought. It's easy enough to select customers who have bought a television. It's also simple to select customers who have bought a television or a couch. But how do I select customers who have bought both a television and a couch? The following is returning customers who have bought both or one of the items:
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>I don't have data to test with and I was hoping someone could had an idea.
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>Thanks

create table #Customers (CustomerID int, CustomerName varchar(50))
create table #Products (ProductID int, ProductName varchar(50), Price Money)
create table #Sales (ProductID int, CustomerID int, Quantity int)

insert into #Customers (CustomerID, CustomerName) values (1, 'Robert'), (2, 'James'), (3, 'Anderson')
insert into #Products (ProductID, ProductName, Price) values (1, 'Apple', 1), (2, 'Orange', 5.3), (3, 'Grapes', 2)
insert into #Sales (ProductID, CustomerID, Quantity) values (1, 1, 1), (1, 2, 3), (2, 1, 2), (3, 1, 5), (2, 2, 2), (1, 1, 1)

select		distinct
		Cust.CustomerId, 
		Cust.CustomerName
	from	#Customers Cust
	inner	join #Sales Sp1 On Cust.CustomerId = Sp1.CustomerId and Sp1.ProductID = (select ProductID from #Products where ProductName = 'Orange')
	inner	join #Sales Sp2 On Cust.CustomerId = Sp2.CustomerId and Sp2.ProductID = (select ProductID from #Products where ProductName = 'Apple')

drop table #Customers
drop table #Products
drop table #Sales