The string in PL/SQL is actually a sequence of characters with an optional size specification.
The characters could be numeric, letters, blank, special characters or a combination of all.
The CONVERT function in PLSQL is used to convert a string from one character set to another.
Generally, the destination character set contains a representation of all the characters defined in the source character set.
If in any case, a character does not exist in the destination character set, a replacement character appears. These replacement characters can be defined as part of a character set definition.


CONVERT( string1, char_set_to [, char_set_from] )

Parameters Used –

  1. string1 –
    It is used to specify the string to be converted. It can be any of the datatypes CHAR, VARCHAR2, NCHAR, NVARCHAR2, CLOB, or NCLOB.
  2. char_set_to –
    It is used to specify the character set to which the string needs to be converted.
  3. char_set_from –
    It is an optional parameter which is used to specify the character set from which the string needs to be converted.

Note – Both the destination and source character set arguments can be either literals or columns containing the name of the character set.

Available Character Sets:

  • US7ASCII : US 7-bit ASCII character set
  • WE8DEC : West European 8-bit character set
  • WE8HP : HP West European Laserjet 8-bit character set
  • F7DEC : DEC French 7-bit character set
  • WE8EBCDIC500 : IBM West European EBCDIC Code Page 500
  • WE8PC850 : IBM PC Code Page 850
  • WE8ISO8859P1 : ISO 8859-1 West European 8-bit character set

Supported Versions of Oracle/PLSQL:

  1. Oracle 12c
  2. Oracle 11g
  3. Oracle 10g
  4. Oracle 9i
  5. Oracle 8i


   Test_String string(10) := 'A B C D';
   Test_String2 string(20) := 'E Ä Ê Í';
   dbms_output.put_line(CONVERT(Test_String, 'US7ASCII', 'WE8ISO8859P1')); 
   dbms_output.put_line(CONVERT(Test_String2, 'US7ASCII')); 


My Personal Notes arrow_drop_up

I am a technology enthusiast who has a keen interest in programming I am pursuing Engineering in Computer Science from GEU, Dehradun I like to unwind by watching movies and English sitcomsI have a keen interest in music

If you like GeeksforGeeks and would like to contribute, you can also write an article using or mail your article to See your article appearing on the GeeksforGeeks main page and help other Geeks.

Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below.

Article Tags :
Practice Tags :

Be the First to upvote.

Please write to us at to report any issue with the above content.