Oracle PL/SQL Tutorial/Character String Functions/LTRIM
Ltrim removes a set of characters from the left of a string
LTRIM stands for "left trim." The general format for this function is: LTRIM(string, characters_to_remove)
<source lang="sql">
SQL> SQL> SELECT LTRIM("...Mitho", ".") FROM dual; LTRIM
Mitho SQL></source>
LTRIM(x [, trim_string]) trim characters from the left of x.
You can supply an optional trim_string that specifies the characters to trim.
If no trim_string is supplied, spaces are trimmed by default.
<source lang="sql">
SQL> SELECT
2 LTRIM(" Hello ")
3 FROM dual;
LTRIM(
Hello SQL></source>
Trim leading and ending letters
<source lang="sql">
SQL> SQL> SQL> create table employees(
2 empno NUMBER(4) 3 , ename VARCHAR2(8) 4 , init VARCHAR2(5) 5 , job VARCHAR2(8) 6 , mgr NUMBER(4) 7 , bdate DATE 8 , msal NUMBER(6,2) 9 , comm NUMBER(6,2) 10 , deptno NUMBER(2) ) ;
Table created. SQL> SQL> SQL> insert into employees values(1,"Jason", "N", "TRAINER", 2, date "1965-12-18", 800 , NULL, 10); 1 row created. SQL> insert into employees values(2,"Jerry", "J", "SALESREP",3, date "1966-11-19", 1600, 300, 10); 1 row created. SQL> insert into employees values(3,"Jord", "T" , "SALESREP",4, date "1967-10-21", 1700, 500, 20); 1 row created. SQL> insert into employees values(4,"Mary", "J", "MANAGER", 5, date "1968-09-22", 1800, NULL, 20); 1 row created. SQL> insert into employees values(5,"Joe", "P", "SALESREP",6, date "1969-08-23", 1900, 1400, 30); 1 row created. SQL> insert into employees values(6,"Black", "R", "MANAGER", 7, date "1970-07-24", 2000, NULL, 30); 1 row created. SQL> insert into employees values(7,"Red", "A", "MANAGER", 8, date "1971-06-25", 2100, NULL, 40); 1 row created. SQL> insert into employees values(8,"White", "S", "TRAINER", 9, date "1972-05-26", 2200, NULL, 40); 1 row created. SQL> insert into employees values(9,"Yellow", "C", "DIRECTOR",10, date "1973-04-27", 2300, NULL, 20); 1 row created. SQL> insert into employees values(10,"Pink", "J", "SALESREP",null,date "1974-03-28", 2400, 0, 30); 1 row created. SQL> SQL> select ename
2 , ltrim(ename,"S") as ltrim_s 3 , rtrim(ename,"S") as rtrim_s 4 from employees;
ENAME LTRIM_S RTRIM_S
-------- --------
Jason Jason Jason Jerry Jerry Jerry Jord Jord Jord Mary Mary Mary Joe Joe Joe Black Black Black Red Red Red White White White Yellow Yellow Yellow Pink Pink Pink 10 rows selected. SQL> SQL> drop table employees; Table dropped. SQL> SQL></source>
