Oracle PL/SQL/Char Functions/LTRIM
Содержание
LTRIM("ABCBCA12345", "ABC")
<source lang="sql">
SQL> SQL> SELECT LTRIM("ABCBCA12345", "ABC")
2 FROM DUAL;
LTRIM
12345
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LTRIM and RTRIM
<source lang="sql">
SQL> SQL> CREATE TABLE old_item (
2 item_id CHAR(20), 3 item_desc CHAR(25) 4 );
Table created. SQL> SQL> INSERT INTO old_item VALUES("LA-101", "Can, Small"); 1 row created. SQL> INSERT INTO old_item VALUES("LA-102", "Can, Large"); 1 row created. SQL> INSERT INTO old_item VALUES("LA-103", "Bottle, Small"); 1 row created. SQL> INSERT INTO old_item VALUES("LA-104", "Bottle, Large"); 1 row created. SQL> INSERT INTO old_item VALUES("NY-101", "Box, Small"); 1 row created. SQL> INSERT INTO old_item VALUES("NY-102", "Box, Large"); 1 row created. SQL> INSERT INTO old_item VALUES("NY-103", "Shipping Carton, Small"); 1 row created. SQL> INSERT INTO old_item VALUES("NY-104", "Shipping Carton, Large"); 1 row created. SQL> SQL> SELECT "Item " ||
2 item_id || 3 " is described as a " || 4 item_desc || 5 "." "Item Description Sentence" 6 FROM old_item;
Item Description Sentence
Item LA-101 is described as a Can, Small . Item LA-102 is described as a Can, Large . Item LA-103 is described as a Bottle, Small . Item LA-104 is described as a Bottle, Large . Item NY-101 is described as a Box, Small . Item NY-102 is described as a Box, Large . Item NY-103 is described as a Shipping Carton, Small . Item NY-104 is described as a Shipping Carton, Large . 8 rows selected. SQL> SQL> SQL> SQL> drop table OLD_ITEM; Table dropped. SQL> SQL>
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LTRIM function removes leading characters
<source lang="sql">
SQL> SQL> --LTRIM function removes leading characters SQL> SQL> SELECT LTRIM("ST" , "STEVENS") AS TRIM FROM Dual; T -
SQL>
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LTRIM("OPS$SPORANO", "OPS$")
<source lang="sql">
SQL> SQL> SELECT LTRIM("OPS$SPORANO", "OPS$")
2 FROM DUAL;
LTRI
RANO
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Ltrim: removes a set of characters from the left of a string
<source lang="sql">
SQL> SQL> -- Ltrim: removes a set of characters from the left of a string. SQL> SQL> SQL> -- LTRIM stands for "left trim." SQL> -- The general format for this function is: SQL> SQL> -- LTRIM(string, characters_to_remove) SQL> SQL> SELECT LTRIM("...Mitho", ".") FROM dual; LTRIM
Mitho SQL>
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select """ || ltrim(ome String" ) || """ "A String"
<source lang="sql">
SQL> SQL> select """ || ltrim( " Some String" ) || """ "A String" from dual; A String
"Some String" 1 row selected. SQL> SQL> --
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Trim letter S from both sides
<source lang="sql">
SQL> SQL> create table emp
2 ( empno NUMBER(4) constraint E_PK primary key 3 , ename VARCHAR2(8) 4 , init VARCHAR2(5) 5 , job VARCHAR2(8) 6 , mgr NUMBER(4) 7 , bdate DATE 8 , sal NUMBER(6,2) 9 , comm NUMBER(6,2) 10 , deptno NUMBER(2) default 10 11 ) ;
Table created. SQL> insert into emp values(1,"Tom","N", "Coder", 13,date "1965-12-17", 800 , NULL, 20); 1 row created. SQL> insert into emp values(2,"Jack","JAM", "Tester",6,date "1961-02-20", 1600, 300, 30); 1 row created. SQL> insert into emp values(3,"Wil","TF" , "Tester",6,date "1962-02-22", 1250, 500, 30); 1 row created. SQL> insert into emp values(4,"Jane","JM", "Designer", 9,date "1967-04-02", 2975, NULL, 20); 1 row created. SQL> insert into emp values(5,"Mary","P", "Tester",6,date "1956-09-28", 1250, 1400, 30); 1 row created. SQL> insert into emp values(6,"Black","R", "Designer", 9,date "1963-11-01", 2850, NULL, 30); 1 row created. SQL> insert into emp values(7,"Chris","AB", "Designer", 9,date "1965-06-09", 2450, NULL, 10); 1 row created. SQL> insert into emp values(8,"Smart","SCJ", "Coder", 4,date "1959-11-26", 3000, NULL, 20); 1 row created. SQL> insert into emp values(9,"Peter","CC", "Designer",NULL,date "1952-11-17", 5000, NULL, 10); 1 row created. SQL> insert into emp values(10,"Take","JJ", "Tester",6,date "1968-09-28", 1500, 0, 30); 1 row created. SQL> insert into emp values(11,"Ana","AA", "Coder", 8,date "1966-12-30", 1100, NULL, 20); 1 row created. SQL> insert into emp values(12,"Jane","R", "Manager", 6,date "1969-12-03", 800 , NULL, 30); 1 row created. SQL> insert into emp values(13,"Fake","MG", "Coder", 4,date "1959-02-13", 3000, NULL, 20); 1 row created. SQL> insert into emp values(14,"Mike","TJA","Manager", 7,date "1962-01-23", 1300, NULL, 10); 1 row created. SQL> SQL> SQL> select ename
2 , ltrim(ename,"S") as ltrim_s 3 , rtrim(ename,"S") as rtrim_s 4 from emp 5 where deptno = 20;
ENAME LTRIM_S RTRIM_S
-------- --------
Tom Tom Tom Jane Jane Jane Smart mart Smart Ana Ana Ana Fake Fake Fake SQL> SQL> SQL> drop table emp; Table dropped.
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