将参数传递给连接

Question

我需要创建一个用于生成报告的视图。该视图将获取一个用户表，并根据用户 ID 和订单 ID 将其与订单表和工作流表连接起来。视图很复杂，因为我需要多次加入订单表，因为我需要根据几个不同的订单状态加入。

我需要能够计算每个用户处于未结状态的订单数量、状态为“已退回”、“暂停”或“已退回 - 故障”的订单数量以及统计每个用户在各区的订单数。

将所有数据放在一起很好，我刚刚为每个计数要求设置了一个简单的选择，如下所示。我的问题是，这将返回表中所有记录的计数，我需要能够将其限制为在特定时间内将参数化的订单。

我需要一些帮助来获得对连接的时间限制。

select u.FIRST_NAME || ' ' || u.LAST_NAME as ASSIGNED_TO,
u.ID,
j4.TOTAL_AREA1,
j1.total,
j2.TOTAL_OPENED,
j3.TOTAL_RETURNED

from users u
left outer join
(      
 select u1.FIRST_NAME || ' ' || u1.LAST_NAME as ASSIGNED_TO,
        u1.ID,
        COUNT(o1.ORDER_KEY) as total
 from users u1,
  orders o1,
  WORKFLOW_WORKITEM ww1    

 where
        o1.ORDER_KEY = ww1.ENTITY_KEY_NUM
        AND ww1.ENTITY_NAME = 'Order'
        AND ww1.ASSIGNED_TO = U1.ID

 GROUP BY u1.FIRST_NAME,
        u1.LAST_NAME,
        u1.id) j1
on 
j1.ID = u.ID


left outer join 
(      
 select u1.FIRST_NAME || ' ' || u1.LAST_NAME as ASSIGNED_TO,
        u1.ID,
        COUNT(o1.ORDER_KEY) as TOTAL_OPENED
 from users u1,
      ORDERS o1,
      WORKFLOW_WORKITEM ww1    

 where
        o1.CASE_KEY = ww1.ENTITY_KEY_NUM
        AND ww1.ENTITY_NAME = 'Order'
        AND ww1.ASSIGNED_TO = U1.ID
        AND ww1.STATUS_CODE='S_ORD_CA_021'

 GROUP BY u1.FIRST_NAME,
        u1.LAST_NAME,
        u1.id) j2
on 
j2.ID = u.ID
left outer join 
(      
 select u1.FIRST_NAME || ' ' || u1.LAST_NAME as ASSIGNED_TO,
        u1.ID,
        COUNT(o1.ORDER_KEY) as TOTAL_RETURNED
 from users u1,
      ORDERS o1,

      WORKFLOW_WORKITEM ww1    

 where
        o1.ORDER_KEY = ww1.ENTITY_KEY_NUM
        AND ww1.ENTITY_NAME = 'Order'
        AND ww1.ASSIGNED_TO = U1.ID
        AND ww1.STATUS_CODE in ('S_ORD_CA_015', 'S_ORD_CA_016', 'S_ORD_CA_017','S_ORD_CA_018')

 GROUP BY u1.FIRST_NAME,
        u1.LAST_NAME,
        u1.id) j3
on 
j3.ID = u.ID


left outer join
(
select  
        u1.ID,
        COUNT(o1.ORDER_KEY) as TOTAL_AREA1

from    users u1,
        ORDERS o1,
        WORKFLOW_WORKITEM ww1,
        domains dm  

where
        o1.ORDER_KEY = ww1.ENTITY_KEY_NUM
        AND ww1.ENTITY_NAME = 'Order'
        AND ww1.ASSIGNED_TO = U1.ID
        and ww1.DOMAIN_ID=dm.ID
    AND dm.CODE='AREA1'

GROUP BY 
        u1.FIRST_NAME,
        u1.LAST_NAME,
        u1.id,
        ww1.DOMAIN_ID,
        dm.DESCRIPTION
       ) j4
on 
j4.ID = u.ID

Answer 1

基本上你想添加类似的东西：

o1.DATE between :param_from and :param_to

在每个“订单”子查询中。 :notation 是 oracle 参数的标准，但如何绑定参数取决于您用于执行查询的环境。所以请写出你使用的环境/工具。

你可以尝试简化查询（希望我没有犯任何语法错误，我是用记事本写的……）：

select 
    ASSIGNED_USER, 
    UID, 
    count(AREA1) TOTAL_AREA1, 
    count(1) TOTAL,
    count(OPENED) TOTAL_OPENED,
    count (RETURNED) TOTAL_RETURNED
from
    (
    select 
        u1.id UID,
        u1.FIRST_NAME || ' ' || u1.LAST_NAME as ASSIGNED_USER,
        case when dm.CODE='AREA1' then 1 else null end AREA1,
        case when ww1.STATUS_CODE='S_ORD_CA_021' then 1 else null end OPENED,
        case when ww1.STATUS_CODE in 
          ('S_ORD_CA_015', 'S_ORD_CA_016', 'S_ORD_CA_017','S_ORD_CA_018') then 1
            else null end RETURNED
    from users u1
        left outer join WORKFLOW_WORKITEM ww1 on AND ww1.ASSIGNED_TO = U1.ID
            AND ww1.ENTITY_NAME = 'Order'
        left outer join orders o1 on o1.ORDER_KEY = ww1.ENTITY_KEY_NUM
        left outer join domains dm on ww1.DOMAIN_ID=dm.ID
    where 
        o1.DATE between :param_from and :param_to
        -- you can add any other conditions that may 
        -- cut number of selected records
        -- to minimum required to get expected results
    )
group by UID, ASSIGNED_USER;