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Oracle Database Interview Question:
How To Use LIKE Conditions in Oracle?
Submitted by: AdministratorLIKE 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
Submitted by: Administrator
* '_' 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
Submitted by: Administrator
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