sql remove characters from string left code example

Example 1: sql remove characters from string right

SELECT TRIM('   Exemple   ');						-- 'Exemple'
SELECT LTRIM('   Exemple   ');						-- 'Exemple   '
SELECT RTRIM('   Exemple   ');						-- '   Exemple'
SELECT TRIM(BOTH 'x' FROM 'xxxExemplexxx');			-- 'Exemple'
SELECT TRIM(LEADING 'x' FROM 'xxxExemplexxx');		-- 'Exemplexxx'
SELECT LTRIM('xxxExemplexxx', 'x');					-- 'Exemplexxx'
SELECT TRIM(TRAILING 'x' FROM 'xxxExemplexxx'); 	-- 'xxxExemple'
SELECT RTRIM('xxxExemple', 'x');					-- 'Exemplexxx'

Example 2: sql left characters

-- For Oracle only

-- syntax 
SUBSTR(<main-string>,1,<number-of-characters>)

-- example 
SUBSTR('Useless stuff',1,10) -- OUTPUT: Useless st

-- practical example
SELECT SUBSTR('Useless stuff',1,10)
FROM DUAL;