从查询创建视图-oracle

你可以 parameterize a view

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,比如两次使用子查询时,它们非常方便 whatever IN ( sub-query ) 过滤器。

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