SQL Server Execution Plans - Red Gate Software

Chapter 5: Controlling Execution Plans with Hints
SELECT pm.Name AS ProductModelName,
p.Name AS ProductName,
SUM(pin.Quantity)
FROM Production.ProductModel pm
JOIN Production.Product p
ON pm.ProductModelID = p.ProductModelID
JOIN Production.ProductInventory pin
ON p.ProductID = pin.ProductID
GROUP BY pm.Name,
p.Name ;
Listing 5.35
It results in the execution plan in Figure 5.33.
Figure 5.33
As you can see, an Index Scan operation against the ProductModel database
returns the first stream of data. This is joined against a Clustered Index Scan operation
from the Product table, through a Hash Match join operator. The data from the
ProductInventory table can be retrieved through a Clustered Index Seek and this is
then joined to the other data through a Nested Loops join. Finally, the optimizer builds
the summation information through a Stream Aggregate operator.
If we decided that we thought that getting the Product information a bit quicker might
make a difference in the behavior of the query, we could add the FASTFIRSTROW table
hint to that table.
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