Example:The following example return several substrings of string "THIS IS A FEATURED ARTICLE"

SELECT SUBSTR('THIS IS A FEATURED ARTICLE', 11, 8) FROM DUAL;OUTPUT : FEATURED

SELECT SUBSTR('THIS IS A FEATURED ARTICLE', -7, 7) FROM DUAL;OUTPUT : ARTICLE

SELECT SUBSTR('THIS IS A FEATURED ARTICLE', 11) FROM DUAL;OUTPUT : FEATURED ARTICLE

SELECT TRIM(' HELLO ');

Result: 'HELLO'

SELECT LTRIM(' HELLO ');

Result: 'HELLO '

SELECT RTRIM(' HELLO ');

Result: ' HELLO'

SELECT TRIM (0 FROM 0009872348900) FROM DUAL;

98723489

SELECT TRIM (‘ this is a test. ') from dual;

this is a test.

SELECT TRIM('x' FROM 'xxxxthis is a test.xxxx') from dual;

this is a test.

TRUNC(125.815)Result: 125

TRUNC(125.815, 0)Result: 125

TRUNC(125.815, 1)Result: 125.8

TRUNC(125.815, 2)Result: 125.81

TRUNC(125.815, 3)Result: 125.815

TRUNC(-125.815, 2)Result: -125.81

TRUNC(125.815, -1)Result: 120

TRUNC(125.815, -2)Result: 100

TRUNC(125.815, -3)Result: 0