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Retrieving Data Using Data Query Language
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List customer accounts opened during January 2005. Note that logical operators work on date columns just as well as they do on numeric and character format columns:
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SELECT CUSTOMER_ACCOUNT_ID, DATE_ENROLLED FROM CUSTOMER_ACCOUNT WHERE DATE_ENROLLED BETWEEN '2005/01/01' AND '2005/01/31'; CUSTOMER_ACCOUNT_ID ------------------1 2 2 rows selected. DATE_ENROLLED -------------2005-01-01 2005-01-18
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N OTE : In Oracle, the default date format must be changed in order for this example to work correctly. This statement will change the date format for the current database session to the format used in the example:
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ALTER SESSION SET NLS_DATE_FORMAT='YYYY/MM/DD'
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The LIKE operator is used to compare a character value to a pattern, returning a logical true if the character value matches the pattern, and false if not. Two wildcard characters may be used in the pattern: Underscore (_) The underscore character (_) may be used as a positional wildcard, meaning it matches any character in that position of the character string being evaluated. Percent (%) The percent sign (%) may be used as a nonpositional wildcard, meaning it matches any number of characters for any length. Note that Microsoft Access has a similar feature, but the question mark ( ) is used as the positional wildcard, and the asterisk (*) as the nonpositional wildcard (these match the conventions used in DOS and Visual Basic).
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Here are some sample patterns to help you visualize the use of patterns containing wildcards:
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Pattern %Now Now% %Now% N_w Interpretation Matches any character string that ends with Now . Matches any character string that begins with Now . Matches any character string that contains Now (whether at the beginning, the end, or in the middle). Matches any character string containing exactly three characters, where the rst character is N and the last character is w . Matches any character string that contains the character N followed by any character, followed by the character w , whether at the beginning, end, or in the middle of the string.
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%N_w%
Keep in mind that data in relational databases is always case sensitive. A lowercase letter in the data will not match with an uppercase letter in a LIKE clause pattern, and vice versa. However, the UPPER and LOWER functions introduced a little later in this chapter can be used to shift the case of the data coming from the database to make matching mixed case data a little easier. Here is an example using the LIKE operator: List all movie titles that contain the character string on :
SELECT MOVIE_TITLE FROM MOVIE WHERE MOVIE_TITLE LIKE '%on%'; MOVIE_TITLE --------------------13 Going on 30 Lost in Translation Man on Fire Monster Road to Perdition 5 rows selected.
Perhaps that isn t quite what you wanted. If you had intended to nd titles that contained only the word on instead of the letters on when they appear as part of a word, you should have placed spaces in the pattern, like this:
Retrieving Data Using Data Query Language
SELECT MOVIE_TITLE FROM MOVIE WHERE MOVIE_TITLE LIKE '% on %'; MOVIE_TITLE --------------------13 Going on 30 Man on Fire 2 rows selected.
The IN operator is used to determine if a value falls within a list of values. The list of values may be provided as literal values, using a comma-separated list that is enclosed in parentheses, or may be selected from the database using a subselect, which is a query within a query. Subselects are covered in detail in 5. Here are some examples using the IN operator: List all movies that have a MOVIE_GENRE_CODE of Drama, Forgn or Rmce. Obviously, this query could be written with three equal conditions separated with the OR logical operator, but look how much easier it is to write using the IN operator:
SELECT FROM WHERE ORDER GENRE ----Drama Drama Drama Drama Drama Drama Forgn Rmce Rmce MOVIE_GENRE_CODE AS GENRE, MOVIE_TITLE MOVIE MOVIE_GENRE_CODE IN ('Drama','Forgn','Rmce') BY MOVIE_GENRE_CODE, MOVIE_TITLE; MOVIE_TITLE ---------------------Big Fish Cold Mountain Lost in Translation Monster Mystic River Road to Perdition Das Boot 13 Going on 30 Two Weeks Notice
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