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REPLACE Function


The REPLACE function searches for a character string, search_string, within a given character string, string, and replaces it with a character string, replacement_string. If the string to be replaced, replacement_string is omitted, all search_strings retrieved from string are removed. If NULL is specified as an argument, NULL is returned.


REPLACE( string, search_string [, replacement_string ] )


string :

? character string



search_string :

? character string



replacement_string :

? character string


  • string : Specifies the original string. If the value is NULL, NULL is returned.
  • search_string : Specifies the string to be searched. If the value is NULL, NULL is returned.
  • replacement_string : Specifies the string to replace the search_string. If this value is omitted, string is returned with the search_string removed. If the value is NULL, NULL is returned.


--it returns NULL when an argument is specified with NULL value

SELECT REPLACE('12345abcdeabcde','abcde',NULL);





--not only the first substring but all substrings into 'ABCDE' are replaced

SELECT REPLACE('12345abcdeabcde','abcde','ABCDE');





--it removes all of substrings when replace_string is omitted

SELECT REPLACE('12345abcdeabcde','abcde');