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Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.

Data on both presidents Bush would be retrieved. The underscore character, _, can also be used in text patterns and matches exactly one character. So, if we used a pattern like that in the following code:

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SELECT last_name, first_name FROM presidents WHERE last_name LIKE 'Bu__' ;

Value Syntax [ <name> <integer> ]+ | none | inherit Initial Value none Percentages n/a Inherited no

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We would retrieve the surname Bush. If the USA had had a president John Bull, then data on that fictional president would also be retrieved, since the pattern Bu__ matches any string that is exactly four characters long and begins with the characters Bu. If you plan to use the LIKE keyword, then be aware that support for this keyword depends on the RDBMS package you use. Some database management systems also explore fuller regular expression syntax, sometimes associated with the LIKE keyword, and sometimes, for example MySQL, using the REGEXP keyword. If we wanted to retrieve data from a MySQL database on presidents whose surname begins with the letters K or R we could use the following SQL code:

public int IndexOf(T v) public void InsertRange(int startIdx, IEnumerable<T> c) public int LastIndexOf(T v) public void RemoveRange(int idx, int count) public void Reverse( ) public void Reverse(int startIdx, int count) public void Sort( ) public void Sort(IComparer<T> comp)

SELECT last_name, first_name FROM presidents WHERE last_name REGEXP "^[KR]." ;

Notice the REGEXP keyword, and that the text pattern is, in MySQL at least, contained in paired double quotes. The ^ character at the beginning of the pattern indicates that the text pattern matches the beginning of the data and the square brackets indicate a character class. Any character in the character class that occurs at the beginning of the data in the column will match. The . metacharacter serves a similar function to the % character with the LIKE keyword. Regular expression support in your favorite database management system may not have the functionality that MySQL supports, or may use different metacharacters inside text patterns.

where Kr is the torsional spring rate (in units of torque/angle such as in-lbf/rad or Nm/rad) T is the torque exerted by the spring and Dq is angle through which the spring is turned, relative to its equilibrium position. The potential energy in the spring is given by:

Many pieces of data are reported exactly as they are held in the data store. However, sometimes you will want to retrieve data that combines data from more than one column. SQL provides calculated fields to achieve that functionality. Calculated fields can be created by combining string or numeric values. A field often means the same as a column, and does so in this case. Occasionally, in discussions of databases, you may meet the term field used to refer to the intersection of a particular row and column. That is not the usage in the term calculated field . For example, you might hold address data in separate columns but want to display a city, regional code, and postal code together in an address. SQL code to achieve that might look like the following:

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