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Need to select all rows from table1 that do not have a matching key in table 2

Posted on 2008-09-30
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Last Modified: 2010-04-21
I have two tables ie Customers and Orders

I need to Select all customers for which there are no orders.

ie. Show the CustomerID for all orders where the CustomerID in the Customers table s not found in the CustomerID of the Orders table.
What is the correct SQL syntax ?
Thanks,
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Question by:Dovberman
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4 Comments
 
LVL 11

Accepted Solution

by:
aaronakin earned 125 total points
ID: 22605551
SELECT *
  FROM Customers
  WHERE CustomerID NOT IN (SELECT CustomerID FROM Orders)
0
 
LVL 60

Assisted Solution

by:chapmandew
chapmandew earned 125 total points
ID: 22605560
or like this

select * from customers c where not exists(select 1 from orders o where o.customerid = c.customerid)
0
 
LVL 5

Expert Comment

by:adlink_la
ID: 22605771
If I read that right, you want customers that have no Orders?
SELECT CustomerID
FROM Customers
EXCEPT
SELECT CustomerID 
FROM Orders

Open in new window

0
 

Author Closing Comment

by:Dovberman
ID: 31501551
aaronikin and chapmandew split the points. Both returned 38 rows. adlink la returned 32 rows. Thanks to all.
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