1

我正在寻找一个 MySQL 查询（子查询很好），它将以以下格式获得过去一年中每个订单的单位分布：

units_per_order | number_of_orders | percent_of_total
-------------------------------------------------- ------------------
1 | 7500 | 55%
2
3
4
5
6-10
10-20
30-50
50–100
100+

编辑：

要查询的表和必要的列：

表：订单
字段：orders_id、date_purchased

表：orders_products
字段：orders_id、products_quantity

这就是我现在所拥有的：

选择计数（*）作为数量，数量来自（
        选择 SUM(products_quantity) 作为数量，orders_id
        FROM orders_products op LEFT JOIN orders o USING (orders_id)
        WHERE date_purchased LIKE '2012%'
        GROUP BY orders_id
    ) AS new_table WHERE qty != 0 GROUP BY qty ORDER BY qty

有任何想法吗？

4

1 回答 1

0

好的，这就是我的结果。如果您发现任何提高效率的方法，请告知。

SELECT qty, cnt, ROUND(((cnt / total) * 100)) AS percent FROM (
    SELECT qty, COUNT(*) AS cnt, total
    FROM (
        SELECT
            (
                CASE WHEN (SUM(products_quantity) < 6) THEN SUM(products_quantity)
                    WHEN (SUM(products_quantity) BETWEEN 6 AND 10) THEN 6
                    WHEN (SUM(products_quantity) BETWEEN 11 AND 20) THEN 11
                    WHEN (SUM(products_quantity) BETWEEN 21 AND 50) THEN 21
                    WHEN (SUM(products_quantity) BETWEEN 51 AND 100) THEN 51
                    ELSE 101
                END
            ) AS qty,
            orders_id,
            (
                SELECT COUNT(DISTINCT(orders_id))
                FROM orders JOIN orders_products USING (orders_id)
                WHERE date_purchased LIKE '2012%' AND products_quantity != 0
            ) AS total
        FROM orders_products op JOIN orders o USING (orders_id)
        WHERE date_purchased LIKE '2012%'
        GROUP BY orders_id
    ) AS new_table
    WHERE qty != 0 GROUP BY qty
) AS newer_table
于 2012-12-04T23:05:55.257 回答