Practice Market Analysis I
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Market Analysis I
Tables: Users(user_id INT, join_date DATE, favorite_brand VARCHAR); Orders(order_id INT, order_date DATE, item_id INT, buyer_id INT, seller_id INT); Items(item_id INT, item_brand VARCHAR). Users.user_id, Orders.order_id and Items.item_id are unique. Orders.item_id references Items; buyer_id and seller_id reference Users. Return buyer_id, join_date and orders_in_2019 for every user, counting orders they placed as buyer during calendar year 2019. Retain users with zero such orders. Output order is unrestricted.
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Understanding the Market Analysis I Problem
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Problem Statement
Tables: Users(user_id INT, join_date DATE, favorite_brand VARCHAR); Orders(order_id INT, order_date DATE, item_id INT, buyer_id INT, seller_id INT); Items(item_id INT, item_brand VARCHAR). Users.user_id, Orders.order_id and Items.item_id are unique. Orders.item_id references Items; buyer_id and seller_id reference Users. Return buyer_id, join_date and orders_in_2019 for every user, counting orders they placed as buyer during calendar year 2019. Retain users with zero such orders. Output order is unrestricted.
Source: Market Analysis I on LeetCode. Use the original task for its coding environment and submissions.
Market Analysis I
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Examples
# Example 1
Users table: +---------+------------+----------------+ | user_id | join_date | favorite_brand | +---------+------------+----------------+ | 1 | 2018-01-01 | Lenovo | | 2 | 2018-02-09 | Samsung | | 3 | 2018-01-19 | LG | | 4 | 2018-05-21 | HP | +---------+------------+----------------+ Orders table: +----------+------------+---------+----------+-----------+ | order_id | order_date | item_id | buyer_id | seller_id | +----------+------------+---------+----------+-----------+ | 1 | 2019-08-01 | 4 | 1 | 2 | | 2 | 2018-08-02 | 2 | 1 | 3 | | 3 | 2019-08-03 | 3 | 2 | 3 | | 4 | 2018-08-04 | 1 | 4 | 2 | | 5 | 2018-08-04 | 1 | 3 | 4 | | 6 | 2019-08-05 | 2 | 2 | 4 | +----------+------------+---------+----------+-----------+ Items table: +---------+------------+ | item_id | item_brand | +---------+------------+ | 1 | Samsung | | 2 | Lenovo | | 3 | LG | | 4 | HP | +---------+------------+
+-----------+------------+----------------+ | buyer_id | join_date | orders_in_2019 | +-----------+------------+----------------+ | 1 | 2018-01-01 | 1 | | 2 | 2018-02-09 | 2 | | 3 | 2018-01-19 | 0 | | 4 | 2018-05-21 | 0 | +-----------+------------+----------------+
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