Question

这很有效。但我还想包括那个日期范围内没有销售的商品。目前仅显示在所选日期范围内销售的商品。我希望它能展示那些没有销售的商品。

<?xml version="1.0" encoding="utf-8"?>
<layout>
    <data>
        <import type="android.databinding.ObservableMap" />
        <variable
            name="map"
            type="ObservableMap" />
    </data>
    <TextView xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@{(String)map[`text`]}"/>
</layout>

根据评论进行更新：

已售出的商品被标识为SELECT i.item_number, i.item_name, ish.avg_cost, ish.avg_retail, ish.avg_daily_sales, CASE WHEN i.sold_by_id = '0' THEN 'pcs' WHEN i.sold_by_id = '1' THEN 'lbs' WHEN i.sold_by_id = '2' THEN 'lbs' END [Sold_by] FROM inventory i INNER JOIN (SELECT ish.item_number, AVG(avg_cost) as avg_cost, AVG(avg_retail) as avg_retail, ROUND(AVG(total_sold),0) as avg_daily_sales FROM inventory_sales_history ish LEFT JOIN Inventory i ON i.item_number = ish.Item_Number WHERE ish.the_date BETWEEN '12-11-2016' AND '12-18-2016' AND ish.item_number IN (SELECT item_number FROM inventory i JOIN department d ON d.department_id = i.department_id WHERE d.category_id = '4') GROUP BY ish.item_number)ish ON i.item_number = ish.item_number ORDER BY i.item_name表中的商品，但不在inventory表中

Answer 1

这与DVT的答案相同，因为它将连接更改为从内连接到左连接的子查询。我只是在查看它时稍微重构了一下这个查询。

您可能需要查看Bad habits to kick : mis-handling date / range queries - Aaron Bertrand。

编辑：将部门联接移动到外部查询

select 
     i.item_number
   , i.item_name
   , ish.avg_cost
   , ish.avg_retail
   , ish.avg_daily_sales
   , Sold_by = case 
          when i.sold_by_id = '0' then 'pcs' 
          when i.sold_by_id = '1' then 'lbs' 
          when i.sold_by_id = '2' then 'lbs' 
          end
  from inventory i
    inner join department d on d.department_id = i.department_id 
      and d.category_id='4'
    left join (
     select 
            ish.item_number
          , avg_cost = avg(avg_cost)
          , avg_retail = avg(avg_retail)
          , avg_daily_sales = round(avg(total_sold), 0)
        from inventory_sales_history ish 
        where ish.the_date between '12-11-2016' and '12-18-2016'
        group by ish.item_number
     ) as ish on i.item_number = ish.item_number
  order by i.item_name

Answer 2

SELECT i.item_number, i.item_name, ish.avg_cost, ish.avg_retail, ish.avg_daily_sales,
CASE WHEN i.sold_by_id = '0' THEN 'pcs'
     WHEN i.sold_by_id = '1' THEN 'lbs'
     WHEN i.sold_by_id = '2' THEN 'lbs'
END [Sold_by]
FROM inventory i
LEFT JOIN 
    (SELECT ish.item_number, AVG(avg_cost) as avg_cost, AVG(avg_retail) as avg_retail, ROUND(AVG(total_sold),0) as avg_daily_sales 
    FROM inventory_sales_history ish
        LEFT JOIN Inventory i ON i.item_number = ish.Item_Number
WHERE ish.the_date BETWEEN '12-11-2016' AND '12-18-2016'
AND ish.item_number IN (SELECT item_number FROM inventory i JOIN department d ON d.department_id = i.department_id WHERE d.category_id = '4')
GROUP BY ish.item_number)ish
ON i.item_number = ish.item_number
ORDER BY i.item_name

Answer 3

知道了。你的建议指出了我正确的方向。

SELECT i.item_number
      , i.item_name
      , ish.avg_cost
      , ish.avg_retail
      , ish.avg_daily_sales
      , CASE WHEN i.sold_by_id = '0' THEN 'pcs'
             WHEN i.sold_by_id = '1' THEN 'lbs'
             WHEN i.sold_by_id = '2' THEN 'lbs'
        END [Sold_by]
FROM inventory i LEFT JOIN 
         (
            SELECT ish.item_number
                  , AVG(avg_cost) as avg_cost
                  , AVG(avg_retail) as avg_retail
                  , ROUND(AVG(total_sold),0) as avg_daily_sales 
            FROM inventory_sales_history ish LEFT JOIN Inventory i 
                     ON i.item_number = ish.Item_Number
            WHERE ish.the_date BETWEEN '12-11-2016' AND '12-18-2016'
            GROUP BY ish.item_number
        ) 
        ish ON i.item_number = ish.item_number
WHERE  i.item_number IN 
       (
          SELECT item_number 
          FROM   inventory i JOIN department d 
                ON d.department_id = i.department_id 
          WHERE d.category_id = '4'
       )
ORDER BY i.item_name

包括与WHERE标准不匹配的记录

3 个答案: