Question

表：订单

orders_id customers_id customers_name date_purchased      orders_status
        1           31 aa AA          2014-08-17 01:31:14             3
        3           32 bb BB          2014-08-17 01:35:47             3
        4           33 cc CC          2014-08-17 01:38:46             3
        5           34 dd DD          2014-08-17 01:41:35             3
        9           35 ee EE          2014-08-17 01:46:18             3
       14           36 fl EE          2014-08-17 02:02:12             3
       15           37 gg GG          2014-08-17 02:09:25             3

表：orders_products

orders_products_id orders_id products_id products_model products_name products_price final_price products_tax products_quantity
                 1         1          29                Acai Berry          100.0000    100.0000       0.0000 10
                 5         3          30                Vitamin B            50.0000     50.0000       0.0000 20
                 4         3          29                Acai Berry          100.0000    100.0000       0.0000 10
                 6         4          29                Acai Berry          100.0000    100.0000       0.0000 15
                 7         4          30                Vitamin B            50.0000     50.0000       0.0000 10
                 6         5          29                Acai Berry          100.0000    100.0000       0.0000 30
                16         9          29                Acai Berry          100.0000    100.0000       0.0000 20
                15         9          30                Vitamin B            50.0000     50.0000       0.0000 20
                21        14          29                Acai Berry          100.0000    100.0000       0.0000 30
                22        15          30                Vitamin B            50.0000     50.0000       0.0000 30
                23        15          29                Acai Berry          100.0000    100.0000       0.0000 15

好的，他们是我愿意联合起来代表2014年以这种格式销售的所有商品的两张表。

products_id, products_name, year, month, total_sales
     1          Acai Berry  2014   01         0
     1          Acai Berry  2014   02         0
     1          Acai Berry  2014   03         0
     1          Acai Berry  2014   04         0
     ....
     1          Acai Berry  2014   12         0
     2          Vitamin B   2014   01         0        
     ... and so on




*Query I was working on - it displays only the months that items were sold.


SELECT
 op.products_id,
 op.products_name,
 IFNULL(t.year, 2014) as year,
 t.month as month,
 ROUND(SUM(op.final_price * op.products_quantity), 2) as total_sales
 FROM
    (SELECT 2014 AS year, 1 AS month UNION 
     SELECT 2014 AS year, 2 AS month UNION 
     SELECT 2014 AS year,3 AS month UNION 
     SELECT 2014 AS year,4 AS month UNION 
     SELECT 2014 AS year,5 AS month UNION
     SELECT 2014 AS year,6 AS month UNION 
     SELECT 2014 AS year,7 AS month UNION 
     SELECT 2014 AS year,8 AS month UNION 
     SELECT 2014 AS year,9 AS month UNION 
     SELECT 2014 AS year,10 AS month UNION 
     SELECT 2014 AS year,11 AS month UNION 
     SELECT 2014 AS year,12 AS month
) AS t 
LEFT JOIN orders o on YEAR(o.date_purchased) = t.year AND MONTH(o.date_purchased) = t.month
LEFT JOIN orders_products op on o.orders_id = op.orders_id
WHERE t.year = 2014 AND o.orders_status = 3
GROUP BY op.products_id, t.month

即使物品可能根本没有出售，我怎样才能显示所有月份？

P.S。：如果可能的话，这种格式会更好，更好：

              Jan  Feb  Mar  Apr  May Jun July     Aug    Sep Oct Nov Dec
Acai Berry     0    0    0    0    0   0   0     1000.00   0   0   0   0
Vitamin B      0    0    0    0    0   0   0     2000.00   0   0   0   0
More Items...  0    0    0    0    0   0   0        0      0   0   0   0

对我有任何提示或建议吗？提前谢谢。

Answer 1

您可以使用SUM（），但在每个SUM中使用IF子句。

像这样的东西

SELECT b.product_name
    SUM(IF(YEAR(a.date_purchased) = 2014 AND MONTH(a.date_purchased) = 1), products_quantity, 0) AS Jan,
    SUM(IF(YEAR(a.date_purchased) = 2014 AND MONTH(a.date_purchased) = 2), products_quantity, 0) AS Fed,
    SUM(IF(YEAR(a.date_purchased) = 2014 AND MONTH(a.date_purchased) = 3), products_quantity, 0) AS Mar,
    SUM(IF(YEAR(a.date_purchased) = 2014 AND MONTH(a.date_purchased) = 4), products_quantity, 0) AS Apr,
    SUM(IF(YEAR(a.date_purchased) = 2014 AND MONTH(a.date_purchased) = 5), products_quantity, 0) AS May,
    SUM(IF(YEAR(a.date_purchased) = 2014 AND MONTH(a.date_purchased) = 6), products_quantity, 0) AS Jun,
    SUM(IF(YEAR(a.date_purchased) = 2014 AND MONTH(a.date_purchased) = 7), products_quantity, 0) AS Jul,
    SUM(IF(YEAR(a.date_purchased) = 2014 AND MONTH(a.date_purchased) = 8), products_quantity, 0) AS Aug,
    SUM(IF(YEAR(a.date_purchased) = 2014 AND MONTH(a.date_purchased) = 9), products_quantity, 0) AS Sep,
    SUM(IF(YEAR(a.date_purchased) = 2014 AND MONTH(a.date_purchased) = 10), products_quantity, 0) AS Oct,
    SUM(IF(YEAR(a.date_purchased) = 2014 AND MONTH(a.date_purchased) = 11), products_quantity, 0) AS Nov,
    SUM(IF(YEAR(a.date_purchased) = 2014 AND MONTH(a.date_purchased) = 12), products_quantity, 0) AS Dec
FROM orders a
INNER JOIN orders_products b
ON a.orders_id = b.orders_id
GROUP BY b.product_name

但是我个人更喜欢每个项目/每月生成一行数据，并在调用脚本中对显示格式进行排序。

修改

如果直接生成列表，则为： -

SELECT sub2.product_name, sub1.amonth, SUM(products_quantity)
FROM 
(
    SELECT 2014 AS ayear, 1 AS amonth UNION 
     SELECT 2014, 2 UNION 
     SELECT 2014, 3 UNION 
     SELECT 2014, 4 UNION 
     SELECT 2014, 5 UNION
     SELECT 2014, 6 UNION 
     SELECT 2014, 7 UNION 
     SELECT 2014, 8 UNION 
     SELECT 2014, 9 UNION 
     SELECT 2014, 10 UNION 
     SELECT 2014, 11 UNION 
     SELECT 2014, 12
) sub1
CROSS JOIN 
(
    SELECT DISTINCT product_name
    FROM orders_products
) sub2
LEFT OUTER JOIN orders a
ON YEAR(a.date_purchased) = sub1.ayear
AND MONTH(a.date_purchased) = sub1.amonth
LEFT OUTER JOIN orders_products b
ON a.orders_id = b.orders_id
AND b.product_name = sub2.product_name
GROUP BY sub2.product_name, sub1.amonth

请注意，如果您有产品表，则可以使用此表来代替第二个子查询。

mysql - 一年中每个项目的月销售额

1 个答案: