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Great technique for case-insensitive text searching

May 20, 2005

Here is a great link on creating Oracle case insensitive indexes searching.

It has some great examples of how to make text searching in Oracle to be case -insensitive:

It shows how setting NLS_COMP=ANSI and NLS_SORT=BINARY_CI will make SQL queries case insensitive.
Also note this example of regular expressions such as using regexp_like to return case insensitive results: REGEXP_LIKE(name,'Suzy','i');
SQL> select name from names;
suzy smith
Suzy Smith
SQL> alter session set NLS_COMP=ANSI;
SQL> alter session set NLS_SORT=BINARY_CI;

SQL> select name from names where name = 'Suzy Smith'

suzy smith
Suzy Smith

So for our example of searching for 'Suzy%' and having an NLS_SORT for case sensitive searching (NLS_SORT=BINARY) we could issue the following types of SELECT statements and get the following results:
SQL> select name from names where REGEXP_LIKE(name,'Suzy');
Suzy Smith

SQL> select name from names where REGEXP_LIKE(name,'Suzy','i');
suzy smith
Suzy Smith


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