我正在尝试从按日期分组的订单的数据库信息中获取。 我有表sales_flat_order,我有它的id,订单创建日期,订单的total_paid和订单项目计数。我有表sales_flat_order_item哪里是订单项目的价格。
我创建了脚本以便在白天获取订单信息:
SELECT
DATE( sales_flat_order.created_at ) AS date,
SUM( sales_flat_order.total_paid ) AS sales,
SUM( sales_flat_order.total_item_count ) AS items
FROM
sales_flat_order,
sales_flat_order_payment
WHERE
sales_flat_order.status = 'complete'
AND sales_flat_order.entity_id = sales_flat_order_payment.parent_id
AND sales_flat_order_payment.method = 'checkmo'
GROUP BY DATE( sales_flat_order.created_at )
WITH ROLLUP
我明白了:
DATE SALES ITEMS
2013-03-05 72 3
2013-03-06 100 5
我有脚本来计算中位数价格:
SELECT
avg(t1.price) as median_val
FROM
(
SELECT
@rownum:=@rownum+1 as `row_number`,
d.price
FROM
sales_flat_order_item d,
(SELECT @rownum:=0) r
WHERE 1
ORDER BY d.price
) as t1,
(
SELECT
count(*) as total_rows
FROM
sales_flat_order_item d
WHERE 1
) as t2
WHERE 1
AND t1.row_number>=total_rows/2
and t1.row_number<=total_rows/2+1;
现在我正在尝试将这两个脚本结合起来:
DATE SALES ITEMS median_item_price
2013-03-05 72 3 19
2013-03-06 100 5 10.5
组合脚本:
SELECT
DATE( sales_flat_order.created_at ) AS date,
SUM( sales_flat_order.total_paid ) AS sales,
SUM( sales_flat_order.total_item_count ) AS items,
sales_flat_order_item.price as median_item_price
FROM
sales_flat_order,
sales_flat_order_payment,
(
SELECT
avg(t1.price) as median_val
FROM
(
SELECT
@rownum:=@rownum+1 as `row_number`,
d.price
FROM
sales_flat_order_item d,
(SELECT @rownum:=0) r
WHERE 1
ORDER BY d.price
) as t1,
(
SELECT
count(*) as total_rows
FROM
sales_flat_order_item d
WHERE 1
) as t2
WHERE 1
AND t1.row_number>=total_rows/2
and t1.row_number<=total_rows/2+1
) as sales_flat_order_item
WHERE
sales_flat_order.status = 'complete'
AND sales_flat_order.entity_id = sales_flat_order_payment.parent_id
AND sales_flat_order_payment.method = 'checkmo'
AND DATE(sales_flat_order_item.created_at) = DATE(sales_flat_order.created_at)
GROUP BY DATE( sales_flat_order.created_at )
WITH ROLLUP
并得到错误:#1248 - 每个派生表必须有自己的别名
这是数据库:http://sqlfiddle.com/#!2/7dfec
有人可以帮忙吗?
答案 0 :(得分:3)
解决方案:
SELECT
DATE( sales_flat_order.created_at ) AS date,
SUM( sales_flat_order.total_paid ) AS sales,
SUM( sales_flat_order.total_item_count ) AS items,
MAX( median.median_val ) as median_item_price
FROM
sales_flat_order,
sales_flat_order_payment,
(
SELECT DATE(sq.created_at) as median_date, avg(sq.price) as median_val FROM (
SELECT t1.row_number, t1.price, t1.created_at FROM(
SELECT IF(@prev!=d.created_at, @rownum:=1, @rownum:=@rownum+1) as `row_number`, d.price, @prev:=d.created_at AS created_at
FROM sales_flat_order_item d, (SELECT @rownum:=0, @prev:=NULL) r
ORDER BY d.price
) as t1 INNER JOIN
(
SELECT count(*) as total_rows, created_at
FROM sales_flat_order_item d
GROUP BY created_at
) as t2
ON t1.created_at = t2.created_at
WHERE 1=1
AND t1.row_number>=t2.total_rows/2 and t1.row_number<=t2.total_rows/2+1
)sq
group by DATE(sq.created_at)
) as median
WHERE
sales_flat_order.status = 'complete'
AND sales_flat_order.entity_id = sales_flat_order_payment.parent_id
AND sales_flat_order_payment.method = 'checkmo'
AND median.median_date = DATE( sales_flat_order.created_at )
GROUP BY DATE( sales_flat_order.created_at )
WITH ROLLUP