Question

我有以下查询：

select
        A.A_ID,
        B.Lib,
        A.Lib,
        C.Lib,
        (SELECT count(*) FROM X WHERE A.A_ID = X.A_ID) AS countX,
        (SELECT count(*) FROM Y WHERE A.A_ID = Y.A_ID) AS countY,
        (SELECT count(*) FROM Z WHERE A.A_ID = Z.A_ID) AS countZ
    from
        A
    left outer join
        C
            on A.C_ID=C.C_ID
    left outer join
        B
            on A.B_ID=B.B_ID
    WHERE
        countX = 2 AND countY = 3
    ORDER BY 
        countZ DESC;

但这给了我以下错误：

SQL错误[904] [42000]：ORA-00904：“ COL_5_0_”：未识别有效期

我该如何解决？

Answer 1

尝试如下，我认为您错过的类型分组将是排序

with cte as
(

select
        A.A_ID,
        B.Lib,
        A.Lib,
        C.Lib,
        (SELECT count(*) FROM X WHERE A.A_ID = X.A_ID) AS countX,
        (SELECT count(*) FROM Y WHERE A.A_ID = Y.A_ID) AS countY,
        (SELECT count(*) FROM Z WHERE A.A_ID = Z.A_ID) AS countZ
    from
        A
    left outer join
        C
            on A.C_ID=C.C_ID
    left outer join
        B
            on A.B_ID=B.B_ID
) select * from cte where countX = 2 AND countY = 3
    Order BY 
    countZ DESC

在Oracle中引用别名子查询

1 个答案: