December 2014
Intermediate to advanced
852 pages
17h 57m
English
Content preview from Joe Celko's SQL for Smarties, 5th Edition
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Chapter 21
LIKE and SIMILAR TO Predicates
Abstract
String matching is done with two built-in functions.
Keywords
ESCAPE
grep()
ISO/IEC 9945
LIKE
Pattern
POSIX
Regular expression
SIMILAR TO
UNIX
UPPER
The LIKE predicate is a string pattern-matching test with the syntax
< like predicate > ::= < match value > [NOT] LIKE < pattern > [ESCAPE < escape character >] < match value > ::= < character value expression > < pattern > ::= < character value expression > < escape character > ::= < character value expression >
The expression “m NOT LIKE p” is equivalent to “NOT (m LIKE p)”, which follows the usual syntax pattern in SQL. There are two wild cards allowed in the < pattern > string. They are the ‘%’ and ‘_’ characters. The ‘_’ character represents ...
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