July 2010
Intermediate to advanced
840 pages
16h 33m
English
Content preview from Joe Celko's SQL for Smarties, 3rd Edition
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5.2. Standard String Functions
SQL-92 defines a set of string functions that appear in most products, but with vendor-specific syntax. You will probably find that products will continue to support their own syntax, but will also add the Standard SQL syntax in new releases. String concatenation is shown with the || operator, taken from PL/I.
The SUBSTRING(<string> FROM <start> FOR <length>) function uses three arguments: the source string, the starting position of the substring, and the length of the substring to be extracted. Truncation occurs when the implied starting and ending positions are not both within the given string.
DB2 and other products have a LEFT and a RIGHT function. The LEFT function returns a string consisting of the specified ...
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