Update Query with Correlated Subquery

Question

I\'m trying to convert a Foxpro application into .NET. As part of that conversion I\'m converting the data from DBF tables to Sql server.

I need to come up with a coupl

Answer 1

Although I think the JOIN criteria is highly unlikely, it looks like you're trying to do this?

EDIT: I've modified the JOIN criteria but this is what you're after. Grouping By columns that are OR'd is odd.

;WITH MinOrderDates AS
(
    SELECT   CustID 
            ,OrderDate  = MIN(OrderDate)
    FROM Orders
    GROUP BY CustID
)

UPDATE C
SET FirstOrderDate = MIN(O.OrderDate)
FROM Customers      C
JOIN MinOrderDates  O   ON C.Id = O.CustID

This is what your query would look like with the ORs

;WITH MinOrderDates AS
(
    SELECT   ShipperId
            ,PickupId
            ,ConsigneeId
            ,DeliveryId
            .BillingId
            ,OrderDate  = MIN(OrderDate)
    FROM Orders
    GROUP BY ShipperId
            ,PickupId
            ,ConsigneeId
            ,DeliveryId
            .BillingId
)

UPDATE C
SET FirstOrderDate = MIN(O.OrderDate)
FROM Customers      C
JOIN MinOrderDates  O   ON o.ShipperId     = C.Id or
                           o.PickupId      = C.Id or
                           o.ConsigneeId   = C.Id or
                           o.DeliveryId    = C.Id or
                           o.BillingId     = C.Id 

EDIT: Though I am having a hard time finding fault with your posted syntax.

Answer 2

Try this

UPDATE customers
SET FirstOrderDate = 
(Select MIN(OrderDate)
FROM Orders
WHERE ShipperId = Customers.Id or
PickupId = Customers.Id or
ConsigneeId = Customers.Id or
DeliveryId = Customers.Id or
BillingId = Customers.Id)