Question

出于性能需求，我想使用以下脚本在提交刷新选项上创建实例化视图：

CREATE TABLE DEVDV 
(DEVDV_ID INTEGER PRIMARY kEY, 
DEVDV_SRC_DVISE_ID INTEGER, 
DEVDV_CIB_DVISE_ID INTEGER);


CREATE TABLE CONDV 
(CONDV_ID INtEgEr PRiMARY KEY, 
CONDV_DEVDV_iD INTEGER, 
CONDV_TX NUMbeR, 
CONDV_DATE_DEB datE, 
CONDV_DATE_FIN DATE);

CREATE MATERIALIZED VIEW LOG ON DEVDV WITH ROWID;

CREATE MATERIALIZED VIEW LOG ON CONDV WITH ROWID;

CREATE MATERIALIZED VIEW MV_DEVDV_TYP_2
REFRESH FAST
ON COMMIT
AS
SELECT DEVDV.ROWID CROWID,
       CONDV.ROWID DROWID,
       DEVDV_ID,
       1 AS MARKER,
       DEVDV_SRC_DVISE_ID,
       DEVDV_CIB_DVISE_ID,
       CONDV_TX, 
       CONDV_DATE_DEB,
       CONDV_DATE_FIN
FROM
    DEVDV INNER JOIN CONDV ON DEVDV_ID = CONDV_DEVDV_ID
UNION ALL
SELECT DEVDV.ROWID CROWID,
       CONDV.ROWID DROW_ID,
       DEVDV_ID,
       2 AS MARKER,
       DEVDV_CIB_DVISE_ID,
       DEVDV_SRC_DVISE_ID,
       1/CONDV_TX, 
       CONDV_DATE_DEB,
       CONDV_DATE_FIN
FROM
    DEVDV INNER JOIN CONDV ON DEVDV_ID = CONDV_DEVDV_ID;

Oracle表示这是一个复杂的查询，不满足快速刷新的要求，

您能告诉我我已经违反规则吗？

谢谢

Answer 1

我不知道为什么，但是-对于oracle中的物化视图-您必须对联接使用旧语法。因此，将所有表放在FROM中，并用逗号分隔它们，然后将连接条件放在where子句中（对外部连接使用“（+）”）。

对我有用：

CREATE MATERIALIZED VIEW MV_DEVDV_TYP_2
REFRESH FAST
ON COMMIT
AS
SELECT DEVDV.ROWID CROWID,
       CONDV.ROWID DROWID,
       DEVDV_ID,
       1 AS MARKER,
       DEVDV_SRC_DVISE_ID,
       DEVDV_CIB_DVISE_ID,
       CONDV_TX, 
       CONDV_DATE_DEB,
       CONDV_DATE_FIN
FROM
    DEVDV, CONDV
WHERE DEVDV_ID = CONDV_DEVDV_ID
UNION ALL
SELECT DEVDV.ROWID CROWID,
       CONDV.ROWID DROW_ID,
       DEVDV_ID,
       2 AS MARKER,
       DEVDV_CIB_DVISE_ID,
       DEVDV_SRC_DVISE_ID,
       1/CONDV_TX, 
       CONDV_DATE_DEB,
       CONDV_DATE_FIN
FROM
    DEVDV, CONDV 
WHERE DEVDV_ID = CONDV_DEVDV_ID;

Materialized view MV_DEVDV_TYP_2 created.

如何使用union（或union all）和联接创建实例化视图

1 个答案: