从查询创建视图-oracle

我有一个在oracle apex中使用的查询。是否可以从这个查询创建视图，其中是jasper报告（jasper不支持cte）

注：P99\u日期从到是参数

with cte as (
SELECT
    a.name,
    w.order as order,
    s.num as num,
    w.id,
    (Select count(*) from quant where id = w.id and trunc(date) between :P99_DATE_FROM and :P99_DATE_TO) as QUANT
FROM
    web w
    left outer JOIN tabel_1 a ON a.id = w.id
    left outer JOIN tabel_2 s ON s.id = w.id
WHERE
    (trunc(s.date) between :P99_DATE_FROM and :P99_DATE_TO or :P99_DATE_FROM is null or :P99_DATE_TO is null)

)
    SELECT 
        name,
        SUM(order) as TOTAL,
        SUM(num) as NUM,
        QUANT
    from cte
    group by name,QUANT

您可以这样做，但是使用Apex提供的参数会使它（甚至）更加复杂

由于在主查询中只引用一次CTE，因此使用内联视图将更简单，将CTE查询转换为子查询：

SELECT 
    name,
    SUM(order) as TOTAL,
    SUM(num) as NUM,
    QUANT
from (
    SELECT
        a.name,
        w.order as order,
        s.num as num,
        w.id,
        (Select count(*) from quant where id = w.id and trunc(date) between :P99_DATE_FROM and :P99_DATE_TO) as QUANT
    FROM
        web w
        left outer JOIN tabel_1 a ON a.id = w.id
        left outer JOIN tabel_2 s ON s.id = w.id
    WHERE
        (trunc(s.date) between :P99_DATE_FROM and :P99_DATE_TO or :P99_DATE_FROM is null or :P99_DATE_TO is null)
)
group by name,QUANT

您可以这样做，但是使用Apex提供的参数会使它（甚至）更加复杂

由于在主查询中只引用一次CTE，因此使用内联视图将更简单，将CTE查询转换为子查询：

SELECT 
    name,
    SUM(order) as TOTAL,
    SUM(num) as NUM,
    QUANT
from (
    SELECT
        a.name,
        w.order as order,
        s.num as num,
        w.id,
        (Select count(*) from quant where id = w.id and trunc(date) between :P99_DATE_FROM and :P99_DATE_TO) as QUANT
    FROM
        web w
        left outer JOIN tabel_1 a ON a.id = w.id
        left outer JOIN tabel_2 s ON s.id = w.id
    WHERE
        (trunc(s.date) between :P99_DATE_FROM and :P99_DATE_TO or :P99_DATE_FROM is null or :P99_DATE_TO is null)
)
group by name,QUANT

---

WITH子句的正常使用是通过其备用名称子查询factoring来显示的。当我们想在查询中多次使用子查询时，例如在两个

which in（sub-query）

过滤器中，它们非常方便

这不适用于您的情况，因此您可以简单地将CTE转换为内联视图：

SELECT 
    name,
    SUM(order) as TOTAL,
    SUM(num) as NUM,
    QUANT
from  (
    SELECT
        a.name,
        w.order as order,
        s.num as num,
        w.id,
        (Select count(*) 
         from quant 
         where id = w.id and trunc(date) between :P99_DATE_FROM and :P99_DATE_TO) as QUANT
    FROM
        web w
        left outer JOIN tabel_1 a ON a.id = w.id
        left outer JOIN tabel_2 s ON s.id = w.id
    WHERE
        (trunc(s.date) between :P99_DATE_FROM and :P99_DATE_TO
          or :P99_DATE_FROM is null or :P99_DATE_TO is null)
    ) cte
 group by name,QUANT

---

WITH子句的正常使用是通过其备用名称子查询factoring来显示的。当我们想在查询中多次使用子查询时，例如在两个

which in（sub-query）

过滤器中，它们非常方便

这不适用于您的情况，因此您可以简单地将CTE转换为内联视图：

SELECT 
    name,
    SUM(order) as TOTAL,
    SUM(num) as NUM,
    QUANT
from  (
    SELECT
        a.name,
        w.order as order,
        s.num as num,
        w.id,
        (Select count(*) 
         from quant 
         where id = w.id and trunc(date) between :P99_DATE_FROM and :P99_DATE_TO) as QUANT
    FROM
        web w
        left outer JOIN tabel_1 a ON a.id = w.id
        left outer JOIN tabel_2 s ON s.id = w.id
    WHERE
        (trunc(s.date) between :P99_DATE_FROM and :P99_DATE_TO
          or :P99_DATE_FROM is null or :P99_DATE_TO is null)
    ) cte
 group by name,QUANT

---

为什么不直接使用内联视图呢？@AlexPoole我不知道如何使用它！为什么不直接使用内联视图呢？@AlexPoole我不知道如何使用它！