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The first types of predicates that I plan to discuss are those that compare data. These predicates, like any predicate, are included in the WHERE clause. You can include a WHERE clause in a SELECT, UPDATE, or DELETE statement, and in each case, the clause can contain one or more comparison predicates. Each predicate in the WHERE clause (whether a comparison predicate or another type) is evaluated on an individual basis to determine whether it meets the condition defined by that predicate. After the predicates are evaluated, the WHERE clause is evaluated as a whole. The clause must evaluate to true in order for a row to be included in a search result, be updated, or be deleted. If the clause evaluates to false or unknown, the row is not included or is not modified. For a complete discussion of how predicates and the WHERE clause are evaluated, see 7. A comparison predicate is a type of predicate that compares the values in a specified column to a specified value. A comparison operator is used to compare those values. You have already seen a number of comparison operators (and, subsequently, comparison predicates) throughout the book. Table 9-1 lists the six comparison operators supported by SQL and provides an example of each one.
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Using Predicates
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IN_STOCK = 47 IN_STOCK <> 47 IN_STOCK < 47 IN_STOCK > 47 IN_STOCK <= 47 IN_STOCK >= 47
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Table 9-1 SQL Comparison Operators You no doubt recognize several of these operators, and even those you don t recognize should be fairly self-explanatory. But let s take a quick look at the examples in Table 9-1 to make sure you understand how a comparison predicate works. In the first row in the table (the Equal to row), the example predicate is IN_STOCK = 47. If this were to appear in a WHERE clause, it would look like the following:
WHERE IN_STOCK = 47
IN_STOCK is the name of the column in the table identified in the statement that contains the WHERE clause. The equals sign (=) is the comparison operator that is used to compare the values in the IN_STOCK column to the value to the right of the equals sign, which in this case is 47. Therefore, for a row to be evaluated to true, the IN_STOCK value for that row must be 47. All six comparison operators work in the same way. In each case, the WHERE clause must evaluate to true in order for the row to be returned in the query results or to be modified. While it is traditional to place the column name to the left of the comparison operator and the constant value to the right, you can reverse them and form an equivalent statement, assuming you also adjust the comparison operator if needed. For example, the following two WHERE clauses are logically identical, each selecting rows with IN_STOCK values greater than 5:
WHERE IN_STOCK > 5 WHERE 5 < IN_STOCK
NOTE
As you learned in 7, you can combine predicates by using the AND keyword or the OR keyword to join together two or more predicates in a WHERE clause. You can also use the NOT keyword to create an inverse condition for a particular predicate. Remember, no matter how many predicates are included in the WHERE clause, the clause must still evaluate to true for a given row to be selected.
Now that you have an overview of the six types of comparison predicates, let s take a look at some examples. These examples are based on Figure 9-1, which shows the data stored in the CDS_ON_HAND table.
SQL: A Beginner s Guide
CD_TITLE: VARCHAR(60) Famous Blue Raincoat Blue Court and Spark Past Light Kojiki That Christmas Feeling Patsy Cline: 12 Greatest Hits
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