Tip

Trimming a string in versions before 8i

In many data manipulation and querying scenarios, you may need to trim a string. To do this in Oracle, LTRIM and RTRIM are available. Here is a utility function that combines the two. Note: this function is a standard feature of Oracle 8i and higher. So it will be of use for those who use Oracle versions less than 8i.

CREATE OR REPLACE FUNCTION trim(p_string VARCHAR2)
RETURN VARCHAR2 IS
 v_new_string  VARCHAR2(1000);
BEGIN
 SELECT RTRIM(LTRIM(p_string))
 INTO   v_new_string
 FROM   DUAL;
 RETURN v_new_string;
END trim;

The result:

select trim('  ssss  ')
from dual;

TRIM
----
ssss

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This was first published in December 2002

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