Question

下面有两个要给出结果的查询

select order.ORDER_NUMBER,
       upc.PROD_ID,
       shipmentItem.upc_id,
       order.ORDER_DATE
  from shipment shipment,
 Order order, shipment_item shipmentItem, UPC upc
 where order.ORDER_DATE > current timestamp - 24
 months
   and order.order_number = shipment.order_number
   and shipmentItem.SHIPMENT_ID = shipment.SHIPMENT_ID
   and order.user_id = '123456'
   and upc.UPC_ID = shipmentItem.UPC_ID
 order by order.ORDER_DATE desc

给出以下输出

 Order_number prod_id  upc_id     order_date

    1234507  6489785  38890630  2018-05-27 13:12:47.564791
    1234504  1310     10855     2018-05-27 13:10:41.475177
    1234504  448832   23431431  2018-05-27 13:10:41.475177

另一个条件聚合为

的查询

select upc_id,
       max(case
             when attr_name = 'COLOR_NORMAL' then
              attr_value
           end) as color,
       max(case
             when attr_name = 'SIZE' then
              attr_value
           end) as size
  from Unary_Upc
 where UPC_ID in (38890630, 10855, 23431431)
 group by UPC_ID;

给出以下输出

upc_id      color   size

10855       (null)  (null)
23431431    White   (null)
38890630    Black    8

如何结合以上两个查询，以使输出如下所示？

   Order_number prod_id  upc_id    color    size   order_date

    1234507     6489785  38890630   Black   8       2018-05-27 13:12:47.564791
    1234504     1310     10855      (null)  (null)  2018-05-27 13:10:41.475177
    1234504     448832   23431431   White   (null)  2018-05-27 13:10:41.475177

Answer 1

您可以使用两个相关的子查询，并针对group by upc_id异常删除了ORA-01422，并根据ANSI-92格式使用别名而不是完整表名来编写查询。

order是保留关键字，因此无法创建 Oracle中名为order的表，但名称为"order"也是可以的。

将current timestamp - 24 months替换为current_timestamp - interval '24' month

select o.order_number, u.prod_id, si.upc_id,       
      (select max(case
              when attr_name = 'COLOR_NORMAL' then
                attr_value
              end)
         from Unary_Upc
        where upc_id = u.upc_id
       ) as color,
      (select max(case
              when attr_name = 'SIZE' then
                  attr_value
              end) 
         from Unary_Upc
        where upc_id = u.upc_id
       ) as size,              
       o.order_date
  from shipment s
  join "order" o on o.order_number = s.order_number
  join shipment_item si on si.shipment_id = s.shipment_id
  join upc u on u.upc_id = si.upc_id
 where order.order_date > current_timestamp  - interval '24' month
   and o.user_id = '123456'
 order by o.order_date desc

Answer 2

您可以通过两种方法来实现它：

---方法1 ---

加入以下两个子查询：

SELECT
    A.ORDER_NUMBER,
    A.PROD_ID,
    A.UPC_ID,
    B.COLOR,
    B.SIZE,
    A.ORDER_DATE
FROM
    (
        SELECT
            ORDER.ORDER_NUMBER,
            UPC.PROD_ID,
            SHIPMENTITEM.UPC_ID,
            ORDER.ORDER_DATE
        FROM
            SHIPMENT SHIPMENT,
            ORDER ORDER,
            SHIPMENT_ITEM SHIPMENTITEM,
            UPC UPC
        WHERE
            ORDER.ORDER_DATE > CURRENT timestamp - 24 months 
            AND ORDER.ORDER_NUMBER = SHIPMENT.ORDER_NUMBER
            AND SHIPMENTITEM.SHIPMENT_ID = SHIPMENT.SHIPMENT_ID
            AND ORDER.USER_ID = '123456'
            AND UPC.UPC_ID = SHIPMENTITEM.UPC_ID
    ) A
    JOIN (
        SELECT
            UPC_ID,
            MAX(CASE
                WHEN ATTR_NAME = 'COLOR_NORMAL' THEN ATTR_VALUE
            END) AS COLOR,
            MAX(CASE
                WHEN ATTR_NAME = 'SIZE' THEN ATTR_VALUE
            END) AS SIZE
        FROM
            UNARY_UPC_ATTR_VAL
        WHERE
            UPC_ID IN (
                38890630,
                10855,
                23431431
            )
        GROUP BY
            UPC_ID
    ) B ON ( A.UPC_ID = B.UPC_ID )
ORDER BY
    A.ORDER_DATE DESC WITH UR

-

---方法2 ---

在第一个查询中使用UNARY_UPC_ATTR_VAL表，并执行GROUP BY，如下所示：

SELECT
    ORDER.ORDER_NUMBER,
    UPC.PROD_ID,
    SHIPMENTITEM.UPC_ID,
    MAX(CASE
        WHEN ATTR_NAME = 'COLOR_NORMAL' THEN ATTR_VALUE
    END) AS COLOR,
    MAX(CASE
        WHEN ATTR_NAME = 'SIZE' THEN ATTR_VALUE
    END) AS SIZE,
    ORDER.ORDER_DATE
FROM
    SHIPMENT SHIPMENT,
    ORDER ORDER,
    SHIPMENT_ITEM SHIPMENTITEM,
    UPC UPC,
    UNARY_UPC_ATTR_VAL UUAV -- ADDED THIS TABLE HERE
WHERE 
    order.ORDER_DATE >current timestamp - 24 months  
    AND ORDER.ORDER_NUMBER = SHIPMENT.ORDER_NUMBER
    AND SHIPMENTITEM.SHIPMENT_ID = SHIPMENT.SHIPMENT_ID
    AND ORDER.USER_ID = '123456'
    AND UPC.UPC_ID = SHIPMENTITEM.UPC_ID
    -- ADDED FOLLOWING CONDITION AND JOIN HERE
    AND UUAV.UPC_ID IN (
        38890630,
        10855,
        23431431
    )
    AND UUAV.UPC_ID = UPC.UPC_ID
    -- ADDED FOLLOWING GROUP BY
GROUP BY
    ORDER.ORDER_NUMBER,
    UPC.PROD_ID,
    SHIPMENTITEM.UPC_ID,
    ORDER.ORDER_DATE
ORDER BY
    ORDER.ORDER_DATE DESC WITH UR

希望，这会为您提供帮助。

干杯！

结合使用条件聚合

2 个答案:

-