Oracle PL/SQL/Char Functions/TRIM
Содержание
- 1 Characters rather than spaces are trimmed
- 2 LEADING: trim from the beginning of a string
- 3 Nesting TRIM function
- 4 Simple demo for TRIM function: removes all specified characters either from the beginning or the ending of a string
- 5 TRAILING: trim from the end of a string
- 6 TRIM from both sides
- 7 TRIM Leading and Trailing Zeroes
- 8 TRIM: removes leading and trailing characters from a string
- 9 Trim space from a string
- 10 TRIM(TRAILING "A" FROM "ABCA") trail
- 11 Trim trailing space from a string
Characters rather than spaces are trimmed
<source lang="sql">
SQL> SQL> -- Characters rather than spaces are trimmed SQL> SQL> SQL> SQL> SELECT TRIM("F" from "Frogs prefer deep water") FROM dual; TRIM("F"FROM"FROGSPREF
rogs prefer deep water SQL>
</source>
LEADING: trim from the beginning of a string
<source lang="sql">
SQL> SQL> -- TRIM "LEADING" SQL> SQL> SELECT TRIM(LEADING "S" FROM "STEVENS" ) AS TRIM FROM Dual; TRIM
TEVENS SQL>
</source>
Nesting TRIM function
<source lang="sql">
SQL> SQL> SQL> SELECT TRIM(TRIM (both "z" from "zzzzz I am asleep zzzzzz")) FROM dual; TRIM(TRIM(B
I am asleep SQL> SQL>
</source>
Simple demo for TRIM function: removes all specified characters either from the beginning or the ending of a string
<source lang="sql">
SQL> SQL> --For example, the following query removes the character "S" from a string: SQL> SQL> SELECT TRIM("S" FROM "STEVENS") AS TRIM FROM Dual; TRIM
TEVEN SQL>
</source>
TRAILING: trim from the end of a string
<source lang="sql">
SQL> SQL> -- TRIM "TRAILING" SQL> SQL> SELECT TRIM(TRAILING "S" FROM "STEVENS" ) AS TRIM FROM Dual; TRIM
STEVEN SQL>
</source>
TRIM from both sides
<source lang="sql">
SQL> SQL> SQL> SELECT TRIM (both " " from " String with blanks ") FROM dual; TRIM(BOTH""FROM"ST
String with blanks SQL>
</source>
TRIM Leading and Trailing Zeroes
<source lang="sql">
SQL> SELECT TRIM (0 FROM 067270676800) "TRIM Example"
2 FROM DUAL;
TRIM Exam
672706768 1 row selected. SQL> --
</source>
TRIM: removes leading and trailing characters from a string
<source lang="sql">
SQL> SQL> -- create demo table SQL> create table Employee(
2 ID VARCHAR2(4 BYTE) NOT NULL, 3 First_Name VARCHAR2(10 BYTE), 4 Last_Name VARCHAR2(10 BYTE), 5 Start_Date DATE, 6 End_Date DATE, 7 Salary Number(8,2), 8 City VARCHAR2(10 BYTE), 9 Description VARCHAR2(15 BYTE) 10 ) 11 /
Table created. SQL> SQL> -- prepare data SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)
2 values ("01","Jason", "Martin", to_date("19960725","YYYYMMDD"), to_date("20060725","YYYYMMDD"), 1234.56, "Toronto", "Programmer")
3 /
1 row created. SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)
2 values("02","Alison", "Mathews", to_date("19760321","YYYYMMDD"), to_date("19860221","YYYYMMDD"), 6661.78, "Vancouver","Tester")
3 /
1 row created. SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)
2 values("03","James", "Smith", to_date("19781212","YYYYMMDD"), to_date("19900315","YYYYMMDD"), 6544.78, "Vancouver","Tester")
3 /
1 row created. SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)
2 values("04","Celia", "Rice", to_date("19821024","YYYYMMDD"), to_date("19990421","YYYYMMDD"), 2344.78, "Vancouver","Manager")
3 /
1 row created. SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)
2 values("05","Robert", "Black", to_date("19840115","YYYYMMDD"), to_date("19980808","YYYYMMDD"), 2334.78, "Vancouver","Tester")
3 /
1 row created. SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)
2 values("06","Linda", "Green", to_date("19870730","YYYYMMDD"), to_date("19960104","YYYYMMDD"), 4322.78,"New York", "Tester")
3 /
1 row created. SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)
2 values("07","David", "Larry", to_date("19901231","YYYYMMDD"), to_date("19980212","YYYYMMDD"), 7897.78,"New York", "Manager")
3 /
1 row created. SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)
2 values("08","James", "Cat", to_date("19960917","YYYYMMDD"), to_date("20020415","YYYYMMDD"), 1232.78,"Vancouver", "Tester")
3 /
1 row created. SQL> SQL> SQL> SQL> -- display data in the table SQL> select * from Employee
2 /
ID FIRST_NAME LAST_NAME START_DAT END_DATE SALARY CITY DESCRIPTION
---------- ---------- --------- --------- ---------- ---------- ---------------
01 Jason Martin 25-JUL-96 25-JUL-06 1234.56 Toronto Programmer 02 Alison Mathews 21-MAR-76 21-FEB-86 6661.78 Vancouver Tester 03 James Smith 12-DEC-78 15-MAR-90 6544.78 Vancouver Tester 04 Celia Rice 24-OCT-82 21-APR-99 2344.78 Vancouver Manager 05 Robert Black 15-JAN-84 08-AUG-98 2334.78 Vancouver Tester 06 Linda Green 30-JUL-87 04-JAN-96 4322.78 New York Tester 07 David Larry 31-DEC-90 12-FEB-98 7897.78 New York Manager 08 James Cat 17-SEP-96 15-APR-02 1232.78 Vancouver Tester 8 rows selected. SQL> SQL> SQL> SQL> SQL> SQL> SQL> SQL> -- TRIM: removes leading and trailing characters from a string. SQL> SQL> -- TRIM([{LEADING | TRAILING | BOTH}]char FROM string) SQL> SQL> select TRIM(First_Name) from employee; TRIM(FIRST
Jason Alison James Celia Robert Linda David James 8 rows selected. SQL> SQL> SQL> -- clean the table SQL> drop table Employee
2 /
Table dropped. SQL> SQL>
</source>
Trim space from a string
<source lang="sql">
SQL> SQL> select """ || trim( " " from " This is a string " ) || """ "Result"
2 from dual 3 /
Result
"This is a string" 1 row selected. SQL> --
</source>
TRIM(TRAILING "A" FROM "ABCA") trail
<source lang="sql">
SQL> SQL> SELECT
2 TRIM("A" FROM "ABCA") both,
3 TRIM(LEADING "A" FROM "ABCA") lead,
4 TRIM(TRAILING "A" FROM "ABCA") trail,
5 TRIM(" ABC ") blank
6 FROM dual;
BO LEA TRA BLA -- --- --- --- BC BCA ABC ABC SQL>
</source>
Trim trailing space from a string
<source lang="sql">
SQL> SQL> select trim( trailing " " from "This is a string " ) "Result"
2 from dual 3 /
Result
This is a string 1 row selected. SQL> SQL> --
</source>
