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If any predicate can be fun, it is the LIKE predicate. The LIKE predicate provides a flexible environment in which you can specify values that are only similar to the values stored in the database. This is particularly advantageous if you know only part of a value but still need to retrieve information based on that value. For example, suppose you don t know the entire title of a CD, but you do know part of that title. Or perhaps you know only part of a performer s name. By using the LIKE predicate, you can ask for values that are similar to what you do know and from those results determine if the information you need is there. Before we take a look at the LIKE predicate itself, let s look at two symbols used within the predicate. The LIKE predicate uses two special characters, the percentage sign (%) and the underscore ( _ ), to help define the search condition specified in the predicate. The percentage sign represents zero or more unknown characters, and the underscore represents exactly one unknown character. You can use these characters at the beginning of a value, in the middle, or at the end, and you can combine them with each other as necessary. The way in which you use these two characters determines the type of data that is retrieved from the database.
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J% %Spark %Blue% %Cline%Hits 194_ 19__ __ue 9__01 9_3%
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Jennifer Warnes, Joni Mitchell, Jose Carreras Court and Spark Famous Blue Raincoat, Blue, Blues on the Bayou Patsy Cline: 12 Greatest Hits 1940, 1942, 1947 1900, 1907, 1938, 1963, 1999 Blue 90201, 91401, 95501, 99301, 99901 9032343, 903, 95312, 99306, 983393300333
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Table 9-2 Using Special Characters in a LIKE Predicate Table 9-2 provides a number of examples of how these special characters can be used in a LIKE predicate. As you can see, the percentage sign and underscore special characters provide a great deal of flexibility and allow you to query a wide range of data.
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Some vendor implementations can be configured to be case insensitive for data comparisons, meaning that lowercase letters and uppercase letters compare as the same. In fact, this is the default behavior for SQL Server and Sybase; however, Oracle is always case sensitive. Looking at Table 9-2, uppercase letters in the Sample Value column can be changed to lowercase with the same results whenever the DBMS is configured as case insensitive. For example, a LIKE predicate value of %spark will still select the Court and Spark row in a case-insensitive implementation.
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Now that you have an understanding of the special characters, let s take a look at the LIKE predicate as a whole. The LIKE predicate includes the column name, the LIKE keyword, and a value enclosed in a set of single quotation marks, which is then enclosed in a set of parentheses (the parentheses are optional in most vendor implementations). For example, the following WHERE clause includes one LIKE predicate:
WHERE CD_ID LIKE ('%01')
The predicate includes the CD_ID column, the LIKE keyword, and a value of %01. Only rows that contain the correct value in the CD_ID column are returned in the query results. The CD_ID column is part of the CDS table, which is shown in Figure 9-3. I will be using this table for the examples in this section. Notice that, based on the LIKE predicate defined in the preceding WHERE clause, only one row can be returned by this clause, the row with a CD_ID value of 99301.
9:
Using Predicates
CD_ID: INT 99301 99302 99303 99304 99305 99306 99307
CD_TITLE: VARCHAR(60) Famous Blue Raincoat Blue Court and Spark Past Light Kojiki That Christmas Feeling Patsy Cline: 12 Greatest Hits
Figure 9-3
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