DB2 how to drop overloaded functions

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When you try to drop an overloaded function/procedure, DB2 will report a SQL0476N error code.
For example: if function MY_TOCHAR is overloaded with

CREATE FUNCTION MY_TOCHAR(P DATE) RETURNS VARCHAR(50) LANGUAGE SQL RETURN ...CREATE FUNCTION MY_TOCHAR(P TIME) RETURNS VARCHAR(50) LANGUAGE SQL RETURN ...

And if you want to delete function using:

DROP FUNCTION MY_TOCHAR

You will get following error message:

DB21034E  The command was processed as an SQL statement because it was not a valid Command Line Processor command.  During SQL processing it returned:SQL0476N  Reference to routine "<SCHEMA>.MY_TOCHAR" was made without a signature, but the routine is not unique in its schema.  SQLSTATE=42725

Solution 1: Drop function with explicit signature, like

DROP FUNCTION MY_TOCHAR(DATE)DROP FUNCTION MY_TOCHAR(TIME)

Solution 2: Drop function using specific-name

DROP SPECIFIC FUNCTION <specific-name>

The <specific-name> could be found from SYSIBM.SYSROUTINES:

db2 => SELECT NAME, SPECIFICNAME FROM SYSIBM.SYSROUTINES WHERE NAME = 'MY_TOCHAR' NAME                SPECIFICNAME            -------------------- ------------------------MY_TOCHAR            MY_D3MYTVWGULBL        MY_TOCHAR            MY_TOCHAR              db2 => DROP SPECIFIC FUNCTION MY_TOCHARDB20000I  The SQL command completed successfullydb2 => DROP SPECIFIC FUNCTION MY_D3MYTVWGULBLDB20000I  The SQL command completed successfully

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