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Sams Teach Yourself MySQL in 21 Days, Second Edition
book

Sams Teach Yourself MySQL in 21 Days, Second Edition

by Tony Butcher
December 2002
Beginner content levelBeginner
640 pages
16h 41m
English
Sams
Content preview from Sams Teach Yourself MySQL in 21 Days, Second Edition

Operators

There are several types of operators: for comparison, arithmetic, logical operations, pattern matching, type casting, and bitwise operations. Let's go through these types one at a time.

Comparison Operators

The comparison operators have their syntax as follows:

  • = (equal to)

  • <=> (NULL-safe equal to)

  • != or <> (not equal to)

  • < (less than)

  • <= (less than or equal to)

  • >= (greater than or equal to)

  • > (greater than)

  • expr IS [NOT] NULL (is or is not NULL)

  • expr IN (expr1, expr2, ...) (expression in range of possible values)

  • expr BETWEEN expr_min AND expr_max (expression between two given values)

Comparison operators return 1 if the result of a comparison is true, or 0 if the result is false. Here are a few examples with = (equals):

SELECT 1 = 1 returns ...

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Publisher Resources

ISBN: 0672323923Purchase book