в 13:45, 26 мая 2010

2010-05-26T13:45:19Z

Admin: 1 версия

2010-05-26T09:58:50Z

1 версия

Новая страница

==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>

← Предыдущая	Версия 13:45, 26 мая 2010
(нет различий)

Oracle PL/SQL/Char Functions/TRIM - История изменений

в 13:45, 26 мая 2010

Admin: 1 версия