Basic Oracle Concepts and Programming Question:

LIKE condition is also called pattern patch. There 3 main rules on using LIKE condition:

* '_' is used in the pattern to match any one character.
* '%' is used in the pattern to match any zero or more characters.
* ESCAPE clause is used to provide the escape character in the pattern.

The following script provides you some good pattern matching examples:

SELECT CASE WHEN 'globalguideline.com' LIKE '%Center%'
THEN 'TRUE' ELSE 'FALSE' END FROM DUAL;
TRUE

SELECT CASE WHEN 'globalguideline.com' LIKE '%CENTER%'
THEN 'TRUE' ELSE 'FALSE' END FROM DUAL;
-- Case sensitive by default
FALSE

SELECT CASE WHEN 'globalguideline.com' LIKE '%Center_com'
THEN 'TRUE' ELSE 'FALSE' END FROM DUAL;
TRUE

SELECT CASE WHEN '100% correct' LIKE '100% %' ESCAPE ''
THEN 'TRUE' ELSE 'FALSE' END FROM DUAL;
TRUE