轉自：http://download.oracle.com/docs/cd/B13789_01/server.101/b10759/statements_6004.htm

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Creating User-Defined Operators: Example

This example creates a very simple functional implementation of equality and then creates an operator that uses the function:

CREATE FUNCTION eq_f(a VARCHAR2, b VARCHAR2) RETURN NUMBER AS
BEGIN
IF a = b THEN RETURN 1;
ELSE RETURN 0;
END IF;
END;
/

CREATE OPERATOR eq_op
BINDING (VARCHAR2, VARCHAR2)
RETURN NUMBER
USING eq_f;

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