[leetcode][Database][Hard] 1479. Sales by Day of the Week

題目 Table: Orders +---------------+---------+ | Column Name | Type | +---------------+---------+ | order_id | int | | customer_id | int | | order_date | date | | item_id | varchar | | quantity | int | +---------------+---------+ (ordered_id, item_id) is the primary key for this table. This table contains information on the orders placed. order_date is the date item_id was ordered by the customer with id customer_id. Table: Items...

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