一个项目要求视图建主键，下面是一个例子

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, ------休息次数
NVL(SUM(C.RESTTIME), 0) AS RESTTIME, ------休息时长（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....'