Composição de entidade em banco de dados

CREATE DATABASE DB;
GO

USE DB;
GO

CREATE TABLE PROCESSO(
  ID INT IDENTITY,
  DESCRICAO VARCHAR(50) NOT NULL,
  CONSTRAINT PK_PROCESSO PRIMARY KEY(ID)
);
GO

CREATE TABLE SERVICO(
  ID INT IDENTITY,
  DESCRICAO VARCHAR(50) NOT NULL,
  CONSTRAINT PK_SERVICO PRIMARY KEY(ID)
);
GO

CREATE TABLE PROCESSO_SERVICO(
  ID INT IDENTITY,
  PROCESSO_ID INT NOT NULL,
  SERVICO_ID INT NOT NULL,
  CONSTRAINT PK_PROCESSO_SERVICO PRIMARY KEY(ID),
  CONSTRAINT FK_PROCESSO_SERVICO_PROCESSO FOREIGN KEY(PROCESSO_ID) REFERENCES PROCESSO(ID),
  CONSTRAINT FK_PROCESSO_SERVICO_SERVICO FOREIGN KEY(SERVICO_ID) REFERENCES SERVICO(ID)
);
GO

INSERT INTO PROCESSO VALUES('PROCESSO A');
INSERT INTO PROCESSO VALUES('PROCESSO B');
GO

INSERT INTO SERVICO VALUES('SERVICO A1');
INSERT INTO SERVICO VALUES('SERVICO A2');
GO

INSERT INTO SERVICO VALUES('SERVICO B1');
INSERT INTO SERVICO VALUES('SERVICO B2');
INSERT INTO SERVICO VALUES('SERVICO B1');
GO

INSERT INTO PROCESSO_SERVICO VALUES(1, 1);
INSERT INTO PROCESSO_SERVICO VALUES(1, 2);
GO

INSERT INTO PROCESSO_SERVICO VALUES(2, 3);
INSERT INTO PROCESSO_SERVICO VALUES(2, 4);
INSERT INTO PROCESSO_SERVICO VALUES(2, 5);
GO

SELECT SERVICO.ID
      ,SERVICO.DESCRICAO
  FROM SERVICO
 INNER JOIN PROCESSO_SERVICO
    ON PROCESSO_SERVICO.SERVICO_ID = SERVICO.ID
 WHERE PROCESSO_SERVICO.PROCESSO_ID = ?;