(operators 2)
PostgreSQL
Object Relational DataBase Management System

演算子の拡張(2)

演算子の登録
CREATE OPERATOR + (
    leftarg = complex,
    rightarg = complex,
    procedure = complex_add,
    commutator = +
);

演算子の削除
DROP OPERATOR + (complex, complex);

関数の削除
DROP FUNCTION complex_add(complex, complex);