oracle - 快速刷新 MView 创建 ORA-12015: 无法从复杂查询创建快速刷新物化视图

Question

我想创建 m-view 来保存交易历史中的现金汇总。

查询如下。

CREATE MATERIALIZED VIEW MV_CASH_STATS

BUILD IMMEDIATE REFRESH FAST ON DEMAND 
AS

( -- Total aggregates 
    SELECT
        'total' AS CODE
        , COUNT(T.CASH_IN) AS DEPOSITS
        , COUNT(T.CASH_OUT) AS WITHDRAWS
        , SUM(T.CASH_IN) AS DEPOSIT
        , SUM(T.CASH_OUT) AS WITHDRAW
    FROM
        TB_CASH_LOG T
)
UNION ALL
( -- Aggregates by account grades
    SELECT
        'grade-' || T1.GRADE AS CODE
        , COUNT(T.CASH_IN) AS DEPOSITS
        , COUNT(T.CASH_OUT) AS WITHDRAWS
        , SUM(T.CASH_IN) AS DEPOSIT
        , SUM(T.CASH_OUT) AS WITHDRAW
    FROM
        TB_CASH_LOG T
        INNER JOIN TB_ACCOUNT T1 ON
            T.ACCOUNT_ID = T1.ID
    GROUP BY T1.GRADE
)

当我执行此操作时，会发生以下错误。

> ORA-12015: cannot create a fast refresh materialized view from a complex query

TB_CASH_LOG（我为和都创建了 m-view 日志表TB_ACCOUNT）

Total aggregates部分没问题，但后面的部分 - -Aggregates by account grades出错了。

我已阅读Oracle basic materialized view docs，并认为INNER JOINorGROUP BY是错误点。

如果是真的，用and快速刷新m-view是不可能的？ 我的 m-view 声明 sql 有什么问题？inner joingroup by

ps我正在使用oracle 18c