CREATE TABLE MASTER (
    ID  BIGINT NOT NULL
);
ALTER TABLE MASTER ADD CONSTRAINT PK_MASTER PRIMARY KEY (ID);

CREATE TABLE SLAVE (
    ID        BIGINT NOT NULL,
    ADDITION  VARCHAR(100)
);
ALTER TABLE SLAVE ADD CONSTRAINT PK_SLAVE PRIMARY KEY (ID);
ALTER TABLE SLAVE ADD CONSTRAINT FK_SLAVE FOREIGN KEY (ID) REFERENCES MASTER (ID);

ALTER TABLE SLAVE ADD CONSTRAINT FK_SLAVE FOREIGN KEY (ID) REFERENCES MASTER(ID) USING INDEX PK_SLAVE;

ALTER TABLE SLAVE failed. Index PK_SLAVE already exists.