Chapter 6. Filtering Data

In this chapter, you will learn how to use the SELECT statement’s WHERE clause to specify search conditions.

Using the WHERE Clause

Database tables usually contain large amounts of data, and you seldom need to retrieve all the rows in a table. More often than not, you’ll want to extract a subset of the table’s data as needed for specific operations or reports. Retrieving just the data you want involves specifying search criteria, also known as a filter condition.

Within a SELECT statement, data is filtered by specifying search criteria in the WHERE clause. The WHERE clause is specified right after the table name (the FROM clause) as follows:


SELECT prod_name, prod_price
FROM products
WHERE prod_price = 2.50;

Analysis ...

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