Beginning Microsoft SQL Server 2008 ... - S3 Tech Training

Chapter 4: JOINs
JOIN Sales.SpecialOfferProduct ssop
ON sso.SpecialOfferID = ssop.SpecialOfferID
WHERE sso.SpecialOfferID != 1
Again, we just lose the words LEFT OUTER JOIN and replace the ON operator with a WHERE clause, or, in
this case, add the ON condition to the existing WHERE clause:
SELECT sso.SpecialOfferID, Description, DiscountPct, ProductID
FROM Sales.SpecialOffer sso,
Sales.SpecialOfferProduct ssop
WHERE sso.SpecialOfferID *= ssop.SpecialOfferID
AND sso.SpecialOfferID != 1
If you were to run this (I’d recommend against doing the change in compatibility level that would be
required, but I want you to know that this kind of code is out there), we would get back the same results
we did in our original OUTER JOIN query. A RIGHT JOIN would function in much the same way.
An Alternative CROSS JOIN
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This is far and away the easiest of the bunch. To create a CROSS JOIN using the old syntax, you just do
nothing. That is, you don’t put anything in the WHERE clause of the FROM: TableA.ColumnA =
TableB.ColumnA.
So, for an ultra quick example, let’s take the first example from the CROSS JOIN section earlier in the
chapter. The ANSI syntax looked like this:
USE Chapter4DB
SELECT v.VendorName, a.Address
FROM Vendors v
CROSS JOIN Address a
To convert it to the old syntax, we just strip out the CROSS JOIN keywords and add a comma:
USE Chapter4DB
SELECT v.VendorName, a.Address
FROM Vendors v, Address a
As with the other examples in this section, we get back the same results that we got with the ANSI syntax:
VendorName Address
--------------------------- --------------------
Don’s Database Design Shop 1234 Anywhere
Don’s Database Design Shop 567 Main St.
Don’s Database Design Shop 999 1st St.
Don’s Database Design Shop 1212 Smith Ave
Don’s Database Design Shop 364 Westin
Dave’s Data 1234 Anywhere
Dave’s Data 567 Main St.
Dave’s Data 999 1st St.