oracle substring code example
Example 1: plsql left() function
SUBSTR( "20190601", 0, 6 )
Example 2: oracle substring
-- ORACLE substr(string, start, [, length ])
SELECT substr('Hello World', 4, 5) FROM DUAL; -- lo Wo
SELECT substr('Hello World', 4) FROM DUAL; -- lo World
SELECT substr('Hello World', -3) FROM DUAL; -- rld
Example 3: plsql substr
SUBSTR( string, start_position [, length ] )
Example 4: oracle leftmost 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;
Example 5: ORACLE SQL SUBSTR
SUBSTR(string, :START_POS, :SUBSTR_LENGTH);
SELECT SUBSTR('ABCDEFG',3,4) FROM DUAL;
--OUTPUT: CDEF
Example 6: oracle right characters
-- For Oracle only
-- syntax
SUBSTR(<main-string>,-<number-of-characters>)
-- example
SUBSTR('Useless stuff',-9) -- OUTPUT: ess stuff
-- practical example
SELECT SUBSTR('Useless stuff',-9)
FROM DUAL;