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13. Rewrite the previous query to use subselects instead of joins. 14. List the last name of each employee along with the last name of their supervisor. 15. List the count of the number of rentals by format (DVD vs. VHS). 16. List the Movie ID and Due Date of all movies that are currently out on rental (Returned Data in Movie Rental contains NULL values) and have not been purchased (Date Sold in Movie Copy contains NULL values). 17. List the Movie ID and Title of any movies that have never been rented. 18. Using subselects to lter rows, list the Movie Title of all movies where there is a VHS copy in the inventory (MEDIA_FORMAT = V , DATE_ SOLD must be null) and yet there is no DVD copy in inventory (MEDIA_ FORMAT = D ). 19. Rewrite the previous query using a join instead of a subselect to nd the VHS movie. 20. List any movie where there are multiple copies in inventory in the same format.
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CHAPTER
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Before we move on to Data Manipulation Language in 7, this chapter is intended to round out your knowledge of SQL queries by covering some advanced topics that were only brushed upon in s 4 and 5. It covers the following topics: Advanced SQL functions, including character, mathematical, and date/time functions A description of how to take advantage of views A description of how to use SQL to generate SQL statements Information on the SQL CASE expression and its use in forming statements that have portions that are only executed under prede ned conditions
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Copyright 2005 by The McGraw-Hill Companies. Click here for terms of use.
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SQL functions were introduced in 4. The topics that follow describe functions that were not covered in 4 but which you will nd useful. In addition to character and mathematical functions, selected date and time functions are also included. Remember that all SQL functions have a common characteristic in that they return a single value, so they are useful in several places in SQL statements, including the SELECT statement column list and WHERE clause. As a reminder, there are many more implementation-speci c functions provided by the various DBMS vendors, so always check the vendor-supplied documentation for more useful functions.
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Character Functions
Character functions operate on character data. This topic presents some commonly used functions in addition to those covered in 4. Except as noted, you will nd the function supported by the most popular SQL implementations, including Microsoft SQL Server, Oracle, DB2, and MySQL.
REPLACE
The REPLACE function searches a character string and replaces characters found in a search string with characters listed in a replacement string. Here is the general syntax:
REPLACE(character_string, search_string, replacement_string)
character_string is the string to be searched and is most often a table column name, but it can be any expression that yields a character string. search_string is the string of one or more characters to be found in character_string. replacement_string is the string that replaces any occurrences of search_ string that are found in character_string. Here is an example that replaces all hyphens (dashes) found in a person s phone number with periods (only the rst two rows in the result set are shown):
SELECT PERSON_PHONE, REPLACE(PERSON_PHONE,'-','.') AS DISPLAY_PHONE FROM PERSON;
Advance Query Writing
PERSON_PHONE --------------230-229-8976 401-617-7297
DISPLAY_PHONE --------------230.229.8976 401.617.7297
LTRIM
The LTRIM function removes any leading (left-hand) spaces in a character string. Note that only leading spaces are removed embedded and trailing spaces are left in the string. There is no data with leading and/or trailing spaces in the video store database, so here is a general example:
LTRIM (' String with spaces ') Returns this string: 'String with spaces '
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