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INVENTORY: INT 6 26 18 2 5 3 25
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Comparing data in the CDS_ON_HAND table
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In the first example we ll look at, the WHERE clause uses an equal to operator to compare the values in the CD_TITLE column with one of the CD titles:
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SELECT CD_TITLE, COPYRIGHT FROM CDS_ON_HAND WHERE CD_TITLE = 'Past Light';
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This statement will return one row with only two values (one for each column specified in the SELECT clause), as shown in the following query results:
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CD_TITLE ---------Past Light COPYRIGHT --------1983
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Now let s change this SELECT statement a bit. Instead of using the equal to operator, I ll use the not equal to operator:
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SELECT CD_TITLE, COPYRIGHT FROM CDS_ON_HAND WHERE CD_TITLE <> 'Past Light';
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When you execute this statement, six rows are returned:
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CD_TITLE ----------------------------Famous Blue Raincoat Blue Court and Spark Kojiki That Christmas Feeling Patsy Cline: 12 Greatest Hits COPYRIGHT --------1991 1971 1974 1990 1993 1988
9:
Using Predicates
Notice that all rows except the Past Light row are included in the query results. In this case, the WHERE clause evaluates to true only when the CD_TITLE value does not equal Past Light. Note, however, that if a row contained a null value for CD_TITLE, that row would not appear in either of the prior result sets. Keep in mind that a comparison with a null value will always evaluate to unknown (null) the DBMS cannot tell what it is either equal to or not equal to because the value is unknown. As you will see later in the Return Null Values section, there are special operators used for dealing with null values. Now let s take a look at the less than operator and the greater than operator. In the next example, I combine two comparison predicates together by using the AND keyword:
SELECT FROM WHERE AND CD_TITLE, INVENTORY CDS_ON_HAND INVENTORY > 2 INVENTORY < 25;
As you can see, the rows returned by this SELECT statement must contain an INVENTORY value between 2 and 25. If you execute this statement, four rows are returned:
CD_TITLE ---------------------Famous Blue Raincoat Court and Spark Kojiki That Christmas Feeling INVENTORY --------6 18 5 3
When defining the predicates in a WHERE clause, you re not limited to using only one column. For instance, if you want to select rows based on both the INVENTORY and RETAIL_PRICE column values, you can modify the last SELECT statement as shown in the following example:
SELECT FROM WHERE AND AND CD_TITLE, INVENTORY CDS_ON_HAND INVENTORY > 2 INVENTORY < 25 RETAIL_PRICE <> 16.99;
Because the conditions are connected using AND, any row returned in the query results must meet all three conditions defined in the WHERE clause. As a result, only three rows are returned when you execute this statement:
CD_TITLE ---------------------Court and Spark Kojiki That Christmas Feeling INVENTORY --------18 5 3
Notice that the query results do not include the RETAIL_PRICE column. That is because this column is not specified in the SELECT clause. Even so, you can still use that column in a predicate in the WHERE clause to define a search condition.
SQL: A Beginner s Guide
Now let s take a look at the less than or equal to operator and the greater than or equal to operator. In the following example, both operators are used to limit the rows returned to those with a COPYRIGHT value that falls within the range of 1971 through 1989.
SELECT FROM WHERE AND CD_TITLE, COPYRIGHT CDS_ON_HAND COPYRIGHT >= 1971 COPYRIGHT <= 1989;
This statement will return slightly different results than what would be returned if you simply used the greater than and less than operators. By using the greater than or equal to operator and the less than or equal to operator, values that equal the specified value are also returned, as shown in the following query results:
CD_TITLE ----------------------------Blue Court and Spark Past Light Patsy Cline: 12 Greatest Hits COPYRIGHT --------1971 1974 1983 1988
Notice that the Blue row includes a COPYRIGHT value of 1971. This would not have been included if you had merely used the greater than operator. Up to this point, the examples I ve shown you have all been based on SELECT statements. However, you can add a WHERE clause to an UPDATE statement or a DELETE statement. Suppose you want to increase the INVENTORY value for the That Christmas Feeling row. You can use the following UPDATE statement:
UPDATE CDS_ON_HAND SET INVENTORY = 10 WHERE CD_TITLE = 'That Christmas Feeling';
When you execute this statement, the INVENTORY value is increased to 10 for the That Christmas Feeling row, but not for any other row because the WHERE clause evaluates to true only for that row. You could have just as easily added this WHERE clause to a DELETE statement, in which case the That Christmas Feeling row would have been deleted. As with the WHERE clause in a SELECT statement, you can combine two or more predicates to form a search condition:
UPDATE SET WHERE AND CDS_ON_HAND INVENTORY = 3 CD_TITLE = 'That Christmas Feeling' COPYRIGHT = 1993;
When you specify the AND keyword, both predicates must evaluate to true in order for the WHERE clause to evaluate to true. If you specify the OR keyword, instead of AND, then only one of the predicates must evaluate to true for the row to be selected.
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