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However, the IN test offers a much more efficient way of expressing the search condition, especially if the set contains more than a few values. The ANSI/ISO SQL standard doesn t specify a maximum limit to the number of items that can appear in the value list, and most
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commercial implementations do not state an explicit upper limit either. For portability reasons, it s generally a good idea to avoid lists with only a single item, such as this one:
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and replace them with a simple comparison test:
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The Pattern Matching Test (LIKE)
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You can use a simple comparison test to retrieve rows where the contents of a text column match some particular text. For example, this query retrieves a row of the CUSTOMERS table by name: Show the credit limit for Smithson Corp.
SELECT COMPANY, CREDIT_LIMIT FROM CUSTOMERS WHERE COMPANY = 'Smithson Corp.';
However, you might easily forget whether the company s name was Smith, Smithson, or Smithsonian. You can use SQL s pattern matching test to retrieve the data based on a partial match of the customer s name. The pattern matching test (LIKE), shown in Figure 6-9, checks to see whether the data value in a column matches a specified pattern. The pattern is a string that may include one or more wildcard characters. These characters are interpreted in a special way.
Wildcard Characters
The percent sign (%) wildcard character matches any sequence of zero or more characters. Here s a modified version of the previous query that uses the percent sign for pattern matching:
SELECT COMPANY, CREDIT_LIMIT FROM CUSTOMERS WHERE COMPANY LIKE 'Smith% Corp.';
The LIKE keyword tells SQL to compare the NAME column to the pattern Smith% Corp. Any of the following names would match the pattern:
Smith Corp. Smithson Corp. Smithsen Corp. Smithsonian Corp.
but these names would not:
SmithCorp Smithson Inc.
FIGURE 6-9
Pattern matching test (LIKE) syntax diagram
6:
Simple Queries
The underscore (_) wildcard character matches any single character. If you are sure that the company s name is either Smithson or Smithsen, for example, you can use this query:
SELECT COMPANY, CREDIT_LIMIT FROM CUSTOMERS WHERE COMPANY LIKE 'Smiths_n Corp.';
In this case, any of these names will match the pattern:
Smithson Corp. Smithsen Corp. Smithsun Corp.
PART II
but these names will not:
Smithsoon Corp. Smithsn Corp.
Wildcard characters can appear anywhere in the pattern string, and several wildcard characters can be within a single string. This query allows either the Smithson or Smithsen spelling and will also accept Corp., Inc., or any other ending on the company name:
SELECT COMPANY, CREDIT_LIMIT FROM CUSTOMERS WHERE COMPANY LIKE 'Smiths_n %';
You can locate strings that do not match a pattern by using the NOT LIKE form of the pattern matching test. The LIKE test must be applied to a column with a string data type. If the data value in the column is NULL, the LIKE test returns a NULL result. If you have used computers through a command-line interface (such as the UNIX shell), you ve probably seen string pattern matching before. Frequently, the asterisk (*) is used instead of the SQL percent sign (%), and the question mark ( ) is used instead of the SQL underscore (_), but the pattern matching capabilities themselves are similar in most situations where a computer application offers the capability to match selected parts of a word or text.
Escape Characters*
One of the problems with string pattern matching is how to match the wildcard characters themselves as literal characters. To test for the presence of a percent sign character in a column of text data, for example, you can t simply include the percent sign in the pattern because SQL will treat it as a wildcard. With some simpler SQL products, you cannot literally match the two wildcard characters. This usually doesn t pose serious problems, because the wildcard characters don t frequently appear in names, product numbers, and other text data of the sort that is usually stored in a database. The ANSI/ISO SQL standard does specify a way to literally match wildcard characters, using a special escape character. When the escape character appears in the pattern, the character immediately following it is treated as a literal character rather than as a wildcard character. (The latter character is said to be escaped.) The escaped character can be either of the two wildcard characters, or the escape character itself, which has now taken on a special meaning within the pattern.
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