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

very few of your tables will have small record counts. You don’t want to have to go scrolling through 10,000
records. What if you had 100,000 or 1,000,000? Even if you felt like scrolling through them all, the time
before the results were back would be increased dramatically. Finally, what do you do when you’re
designing this into your application and you need a quick result that gets straight to the point?
Figure 3-2
What we’re after is a conditional statement that will limit the results of our query to just one product
identifier — 356. That’s where the WHERE clause comes in. The WHERE clause immediately follows the
FROM clause and defines what conditions a record has to meet before it will be shown. For our query, we
would want the ProductID to be equal to 356, so let’s finish our query:
SELECT Name, ProductNumber, ReorderPoint
FROM Production.Product
WHERE ProductID = 356
Run this query against the AdventureWorks2008 database and you should come up with:
Name ProductNumber ReorderPoint
----------------------------- ------------------ ------------
LL Grip Tape GT-0820 600
(1 row(s) affected)
Chapter 3: The Foundation Statements of T-SQL
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