sql server programming: union ? -- sql server programming

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union ?

Re: union ?

Jens
1/20/2006 12:43:38 PM

sql server programming:

If it isn=B4t possible to set the flag for individual customers, you can
only query for the CustomerGroups, right ? If there is something like a
Xref table the query should be something like this:

Select <columnlist>
FROM
Customer C
INNER JOIN CustomerCustomerGroupXref CX
ON C.CustomerId =3D CX.CustomerId
INNER JOIN CustomerGroup CG
ON CG.GroupId =3D CX.GroupId
Where CG.vip_flag =3D 1

Am I right ?

HTH, Jens Suessmeyer.

Re: union ?

Jim Underwood
1/20/2006 3:50:36 PM

I see nothing at all wrong with your original approach, but if you want an
alternative, how about using exists?

select id, code from customers
where vip_flag = 1
or exists (select ... from customers join CustomerGroup
... where CustomerGroup.vip_flag = 1
AND CustomerGroup.CustomerID = Customer.CustomerID
)

[quoted text, click to view]

union ?

Fred
1/20/2006 10:35:10 PM

hi, i have tables Customer, CustomerGroup and CustomerCustomerGroupXref
( :) ), now i want to find customers having say vip_flag, only that flag
can be set for whole gropus and the indivdual customers inside group
wont than have it set

curenty i do

select id, code from customers
where vip_flag = 1

union

select ... from customers join CustomerGroup
.... where CustomerGroup.vip_flag = 1

but there must be a better way ...

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