一个项目要求视图建主键，以下是一个样例

CREATE or replace VIEW SME_V_A....  (AGENTID,AGENTNAME,BUSYNUM,RESTNUM,RESTTIME,DEVICENONUM,DEVICENOSUM
      ,CONSTRAINT AGENTSTATIC_PK PRIMARY KEY (AGENTID) RELY DISABLE NOVALIDATE)
AS
SELECT A.AGENTID as AGENTID, ---座席编号
       (SELECT B.OPERATOR_NAME
          FROM CC_AGENT_INFO B
         WHERE B.WORK_NO = A.AGENTID) AS AGENTNAME, ----坐席姓名
       NVL(SUM(C.BUSYNUM), 0) AS BUSYNUM, -----示忙次数
       NVL(SUM(C.RESTNUM), 0) AS RESTNUM, ------歇息次数
       NVL(SUM(C.RESTTIME), 0) AS RESTTIME, ------歇息时长（分钟）
       NVL(D.DEVICENO_NUM, 0) AS DEVICENONUM, -------接话总量
       NVL(D.DEVICENO_SUM, 0) AS DEVICENOSUM-------接话总时长
  FROM CC_V_.....   A
  LEFT JOIN 。。。。。。
  LEFT JOIN 。

。。。

。。
  GROUP BY A.AGENTID, D.DEVICENO_NUM, D.DEVICENO_SUM;

 查看是否已经存在主键

select a.constraint_name, a.column_name  from user_cons_columns a, user_constraints b where a.constraint_name = b.constraint_name   and b.constraint_type = 'P'   and a.table_name = 'SME_V_A....'