SQL Server Execution Plans - Red Gate Software

Chapter 8: Advanced Topics
ON soh.SalesOrderID = sod.SalesOrderID
INNER JOIN Sales.SpecialOffer AS spo
ON sod.SpecialOfferID = spo.SpecialOfferID
WHERE p.BusinessEntityID = @BusinessEntityId
AND spo.[SpecialOfferID] = @SpecialOfferId )
BEGIN
SELECT p.LastName + ', ' + p.FirstName ,
ea.EmailAddress ,
p.Demographics ,
spo.Description ,
spo.DiscountPct ,
sod.LineTotal ,
pr.Name ,
pr.ListPrice ,
sod.UnitPriceDiscount
FROM Person.Person AS p
INNER JOIN Person.EmailAddress AS ea
ON p.BusinessEntityID = ea.BusinessEntityID
INNER JOIN Sales.Customer AS c
ON p.BusinessEntityID = c.PersonID
INNER JOIN Sales.SalesOrderHeader AS soh
ON c.CustomerID = soh.CustomerID
INNER JOIN Sales.SalesOrderDetail AS sod
ON soh.SalesOrderID = sod.SalesOrderID
INNER JOIN Sales.SpecialOffer AS spo
ON sod.SpecialOfferID = spo.SpecialOfferID
INNER JOIN Production.Product pr
ON sod.ProductID = pr.ProductID
WHERE p.BusinessEntityID = @BusinessEntityId
AND sod.[SpecialOfferID] = @SpecialOfferId;
END
-- use different query to return other data set
ELSE
BEGIN
SELECT p.LastName + ', ' + p.FirstName ,
ea.EmailAddress ,
p.Demographics ,
soh.SalesOrderNumber ,
sod.LineTotal ,
pr.Name ,
pr.ListPrice ,
sod.UnitPrice ,
st.Name AS StoreName ,
ec.LastName + ', ' + ec.FirstName
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