Question

我正在处理汇总查询，该汇总查询将汇总交易总数，提取最近的交易日期，并提取最近的交易数量。我到目前为止所做的是：

SELECT
    A.bill_cust_code,
    A.product_code,
    A.pack_code,
    C.name,
    MAX(A.invoice_date) AS last_purchase_date,
    SUM(IF(A.invoice_date>DATE_FORMAT(NOW(), '%Y'),A.total_sales,0)) AS ytd_sales,
    SUM(IF(A.invoice_date<DATE_FORMAT(NOW(), '%Y') AND A.invoice_date>DATE_FORMAT(NOW() - INTERVAL 1 YEAR, '%Y'),A.total_sales,0)) AS last_year_sales,
    A.source
FROM
    sales AS A
INNER JOIN
    prodware AS B ON (B.product_code = A.product_code AND B.pack_code = A.pack_code AND B.warehouse_code = A.warehouse_code)
INNER JOIN
    product AS C ON A.product_code=C.product_code
WHERE
    B.type='Y'
GROUP BY
    A.bill_cust_code,A.product_code,A.source

sales表有数量列。如何提取与sales对应的quantity。MAX(A.invoice_date)？

示例输出

+----------------+--------------+-----------+-------------------------------+--------------------+------------+-----------------+-----------+
| bill_cust_code | product_code | pack_code | name                          | last_purchase_date | ytd_sales  | last_year_sales | source    |
+----------------+--------------+-----------+-------------------------------+--------------------+------------+-----------------+-----------+
|              6 | DF2CARD      | 110       | ULTRA LOW SULFUR DIESEL 2 C/L | 2012-01-31         | 1022213.71 |     13663316.61 | Cardlock  |
|              6 | DF2CARD      | 104       | ULTRA LOW SULFUR DIESEL 2 C/L | 2010-12-06         |       0.00 |            0.00 | Wholesale |
|              6 | DFGRCARD     | 101       | GREEN DIESEL FUEL CARDLOCK    | 2006-08-31         |       0.00 |            0.00 | Cardlock  |
|              6 | DFGRPP       | LOC       | GREEN DIESEL FUEL PAC PRIDE   | 2008-04-15         |       0.00 |            0.00 | Cardlock  |
|              6 | DFRDCARD     | 108       | ULTRA LOW DYED DIESEL 2 C/L   | 2012-01-31         |   12678.35 |       136566.81 | Cardlock  |
+----------------+--------------+-----------+-------------------------------+--------------------+------------+-----------------+-----------+

我想要另一列last_purchase_quantity，这是MAX(A.invoice_date)返回的记录中的数量。

Answer 1

您可以将上述内容作为子查询，然后在外部查询中选择其他信息。我没有测试我输入的内容，因为我没有这个结构所以请在输入时修正任何错误。

SELECT sub_tab.bill_cust_code,
       sub_tab.product_code,
       sub_tab.pack_code,
       sub_tab.name,
       sub_tab.last_purchase_date,
       (select sales.quantity
        from sales
        where sales.invoice_date=sub_tab.last_purchase_date) as quantity,
       sub_tab.ytd_sales,
       sub_tab.last_year_sales,
       sub_tab.source
RFOM (

 SELECT
    A.bill_cust_code,
    A.product_code,
    A.pack_code,
    C.name,
    MAX(A.invoice_date) AS last_purchase_date,
    SUM(IF(A.invoice_date>DATE_FORMAT(NOW(), '%Y'),A.total_sales,0)) AS ytd_sales,
    SUM(IF(A.invoice_date<DATE_FORMAT(NOW(), '%Y') AND A.invoice_date>DATE_FORMAT(NOW() - INTERVAL 1 YEAR, '%Y'),A.total_sales,0)) AS last_year_sales,
    A.source
FROM
    sales AS A
INNER JOIN
    prodware AS B ON (B.product_code = A.product_code AND B.pack_code = A.pack_code AND B.warehouse_code = A.warehouse_code)
INNER JOIN
    product AS C ON A.product_code=C.product_code
WHERE
    B.type='Y'
GROUP BY
    A.bill_cust_code,A.product_code,A.source
) sub_tab

如何通过另一个MAX（日期时间）列选择列？

1 个答案: