October 2002
Beginner
864 pages
18h 41m
English
Content preview from Sams Teach Yourself SQL in 21 Days, Fourth Edition
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Learning How to Use Operators
Operators are the elements you use inside an expression to articulate how you want specified conditions to retrieve data. Operators fall into six groups: arithmetic, comparison, character, logical, set, and miscellaneous. MySQL utilizes three types of operators: arithmetic, comparison, and logical.
Arithmetic Operators
The arithmetic operators are plus (+), minus (–), divide (/), multiply (*), and modulo (%). The first four are self-explanatory. Modulo returns the integer remainder of a division. Here are two examples:
5 % 2 = 1 6 % 2 = 0
The modulo operator does not work with data types that have decimals, such as Real or Number.
If you place several of these arithmetic operators in an expression without any parentheses, ...
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