SQL TRIM() function
TRIM() function
The SQL TRIM() removes leading and trailing characters(or both) from a character string.
Syntax:
TRIM( [ [{LEADING | TRAILING | BOTH}] [removal_char] FROM ] target_string [COLLATE collation_name])
PostgreSQL and Oracle
All of above platforms support the SQL syntax of TRIM().
Parameters:
Name | Description |
---|---|
LEADING | Right most position of a string. |
TRAILING | Left most position of a string. |
BOTH | Right and left most position of a string. |
removal_char | Character to be removed. |
target_string | String on which the action will take place. |
collation_name | Name of the collation to be applied to the expression. |
MySQL Syntax:
TRIM([{BOTH | LEADING | TRAILING} [remstr] FROM] str); TRIM([remstr FROM] str)
Pictorial Presentation :
Application of TRIM()
In the subsequent pages, we have discussed how to apply TRIM() with various SQL clauses. we have used Oracle 10g Express Edition.
Example:
To remove the right most '1' from '1234567896541' from the DUAL table, the following SQL statement can be used :
SELECT TRIM(TRAILING '1' FROM 1234567896541)
AS TRAILING_TRIM
FROM dual;
In the above example, the "TRAILING_TRIM" is a column alias which will come as a column heading to the output.
Output:
TRAILING_TRIM ------------ 123456789654
SQL TRIM() with trailing character
Sample table : customer
To remove right most 'n' from the 'cust_name' column of 'customer' table, the following SQL statement can be used :
SELECT TRIM(TRAILING 'n' FROM cust_name)
FROM customer;
Output
TRIM(TRAILING'N'FROMCUST_NAME) ----------------------------------- Holmes Micheal Albert Ravindra Cook Stuart Bolt Fleming Jacks Yearannaidu Sasikant Ramanatha Avinash Winsto Karl Shilto Charles Srinivas Steve Karolina Marti Ramesh Rangarappa Venkatpati Sundariya
SQL TRIM() with leading character
To remove the left most '1' from the string '1234567896541' from the DUAL table, the following SQL statement can be used :
SQL Code:
SELECT TRIM(LEADING '1' FROM 1234567896541 )
AS LEADING_TRIM
FROM dual;
In the above example, the "LEADING_TRIM" is a column alias which will come as a column heading to the output.
Output:
LEADING_TRIM ------------ 234567896541
SQL TRIM() on column with leading character
Sample table: customer
To remove left most 'S' from the 'cust_name' column of the 'customer' table, the following SQL statement can be used :
SELECT TRIM(LEADING 'S' FROM cust_name )
FROM customer;
Output:
TRIM(LEADING'S'FROMCUST_NAME) -------------------------------- Holmes Micheal Albert Ravindran Cook tuart Bolt Fleming Jacks Yearannaidu asikant Ramanathan Avinash Winston Karl hilton Charles rinivas teven Karolina Martin Ramesh Rangarappa Venkatpati undariya
SQL TRIM() from both side
To remove the left and right most '1' from the string '1234567896541' from the DUAL table, the following SQL statement can be used:
SQL Code:
SELECT TRIM('1' FROM 1234567896541)
AS BOTH_TRIM
FROM dual;
In the above example, the "BOTH_TRIM" is a column alias which will come as a column heading to the output.
Output
BOTH_TRIM ----------- 23456789654
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