1SELECT TRIM(' Exemple ') FROM dual; -- 'Exemple'
2SELECT LTRIM(' Exemple ') FROM dual; -- 'Exemple '
3SELECT RTRIM(' Exemple ') FROM dual; -- ' Exemple'
4SELECT TRIM(BOTH 'x' FROM 'xxxExemplexxx') FROM dual; -- 'Exemple'
5SELECT TRIM(LEADING 'x' FROM 'xxxExemplexxx') FROM dual; -- 'Exemplexxx'
6SELECT LTRIM('xxxExemplexxx', 'x') FROM dual; -- 'Exemplexxx'
7SELECT TRIM(TRAILING 'x' FROM 'xxxExemplexxx') FROM dual; -- 'xxxExemple'
8SELECT RTRIM('xxxExemple', 'x') FROM dual; -- 'Exemplexxx'