Table: Users
\n+----------------+---------+\n| Column Name | Type |\n+----------------+---------+\n| user_id | int |\n| join_date | date |\n| favorite_brand | varchar |\n+----------------+---------+\nuser_id is the primary key of this table.\nThis table has the info of the users of an online shopping website where users can sell and buy items.\n\n\n
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Table: Orders
\n+---------------+---------+\n| Column Name | Type |\n+---------------+---------+\n| order_id | int |\n| order_date | date |\n| item_id | int |\n| buyer_id | int |\n| seller_id | int |\n+---------------+---------+\norder_id is the primary key of this table.\nitem_id is a foreign key to the Items table.\nbuyer_id and seller_id are foreign keys to the Users table.\n\n\n
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Table: Items
\n+---------------+---------+\n| Column Name | Type |\n+---------------+---------+\n| item_id | int |\n| item_brand | varchar |\n+---------------+---------+\nitem_id is the primary key of this table.\n\n\n
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Write an SQL query to find for each user, the join date and the number of orders they made as a buyer in 2019.
Return the result table in any order.
\n\nThe query result format is in the following example.
\n\n\n
Example 1:
\n\n\nInput: \nUsers table:\n+---------+------------+----------------+\n| user_id | join_date | favorite_brand |\n+---------+------------+----------------+\n| 1 | 2018-01-01 | Lenovo |\n| 2 | 2018-02-09 | Samsung |\n| 3 | 2018-01-19 | LG |\n| 4 | 2018-05-21 | HP |\n+---------+------------+----------------+\nOrders table:\n+----------+------------+---------+----------+-----------+\n| order_id | order_date | item_id | buyer_id | seller_id |\n+----------+------------+---------+----------+-----------+\n| 1 | 2019-08-01 | 4 | 1 | 2 |\n| 2 | 2018-08-02 | 2 | 1 | 3 |\n| 3 | 2019-08-03 | 3 | 2 | 3 |\n| 4 | 2018-08-04 | 1 | 4 | 2 |\n| 5 | 2018-08-04 | 1 | 3 | 4 |\n| 6 | 2019-08-05 | 2 | 2 | 4 |\n+----------+------------+---------+----------+-----------+\nItems table:\n+---------+------------+\n| item_id | item_brand |\n+---------+------------+\n| 1 | Samsung |\n| 2 | Lenovo |\n| 3 | LG |\n| 4 | HP |\n+---------+------------+\nOutput: \n+-----------+------------+----------------+\n| buyer_id | join_date | orders_in_2019 |\n+-----------+------------+----------------+\n| 1 | 2018-01-01 | 1 |\n| 2 | 2018-02-09 | 2 |\n| 3 | 2018-01-19 | 0 |\n| 4 | 2018-05-21 | 0 |\n+-----------+------------+----------------+\n\n", "translatedTitle": null, "translatedContent": null, "isPaidOnly": false, "difficulty": "Medium", "likes": 135, "dislikes": 34, "isLiked": null, "similarQuestions": "[]", "exampleTestcases": "{\"headers\":{\"Users\":[\"user_id\",\"join_date\",\"favorite_brand\"],\"Orders\":[\"order_id\",\"order_date\",\"item_id\",\"buyer_id\",\"seller_id\"],\"Items\":[\"item_id\",\"item_brand\"]},\"rows\":{\"Users\":[[1,\"2018-01-01\",\"Lenovo\"],[2,\"2018-02-09\",\"Samsung\"],[3,\"2018-01-19\",\"LG\"],[4,\"2018-05-21\",\"HP\"]],\"Orders\":[[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\":[[1,\"Samsung\"],[2,\"Lenovo\"],[3,\"LG\"],[4,\"HP\"]]}}", "categoryTitle": "Database", 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"{\"headers\":{\"Users\":[\"user_id\",\"join_date\",\"favorite_brand\"],\"Orders\":[\"order_id\",\"order_date\",\"item_id\",\"buyer_id\",\"seller_id\"],\"Items\":[\"item_id\",\"item_brand\"]},\"rows\":{\"Users\":[[1,\"2018-01-01\",\"Lenovo\"],[2,\"2018-02-09\",\"Samsung\"],[3,\"2018-01-19\",\"LG\"],[4,\"2018-05-21\",\"HP\"]],\"Orders\":[[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\":[[1,\"Samsung\"],[2,\"Lenovo\"],[3,\"LG\"],[4,\"HP\"]]}}", "metaData": "{\n \"mysql\": [\n \"Create table If Not Exists Users (user_id int, join_date date, favorite_brand varchar(10))\",\n \"Create table If Not Exists Orders (order_id int, order_date date, item_id int, buyer_id int, seller_id int)\",\n \"Create table If Not Exists Items (item_id int, item_brand varchar(10))\"\n ],\n \"mssql\": [\n \"Create table Users (user_id int, join_date date, favorite_brand varchar(10))\",\n \"Create table Orders (order_id int, order_date date, item_id int, buyer_id int, seller_id int)\",\n \"Create table Items (item_id int, item_brand varchar(10))\"\n ],\n \"oraclesql\": [\n \"Create table Users (user_id int, join_date date, favorite_brand varchar(10))\",\n \"Create table Orders (order_id int, order_date date, item_id int, buyer_id int, seller_id int)\",\n \"Create table Items (item_id int, item_brand varchar(10))\",\n \"ALTER SESSION SET nls_date_format='YYYY-MM-DD'\"\n ],\n \"database\": true\n}", "judgerAvailable": true, "judgeType": "large", "mysqlSchemas": [ "Create table If Not Exists Users (user_id int, join_date date, favorite_brand varchar(10))", "Create table If Not Exists Orders (order_id int, order_date date, item_id int, buyer_id int, seller_id int)", "Create table If Not Exists Items (item_id int, item_brand varchar(10))", "Truncate table Users", "insert into Users (user_id, join_date, favorite_brand) values ('1', '2018-01-01', 'Lenovo')", "insert into Users (user_id, join_date, favorite_brand) values ('2', '2018-02-09', 'Samsung')", "insert into Users (user_id, join_date, favorite_brand) values ('3', '2018-01-19', 'LG')", "insert into Users (user_id, join_date, favorite_brand) values ('4', '2018-05-21', 'HP')", "Truncate table Orders", "insert into Orders (order_id, order_date, item_id, buyer_id, seller_id) values ('1', '2019-08-01', '4', '1', '2')", "insert into Orders (order_id, order_date, item_id, buyer_id, seller_id) values ('2', '2018-08-02', '2', '1', '3')", "insert into Orders (order_id, order_date, item_id, buyer_id, seller_id) values ('3', '2019-08-03', '3', '2', '3')", "insert into Orders (order_id, order_date, item_id, buyer_id, seller_id) values ('4', '2018-08-04', '1', '4', '2')", "insert into Orders (order_id, order_date, item_id, buyer_id, seller_id) values ('5', '2018-08-04', '1', '3', '4')", "insert into Orders (order_id, order_date, item_id, buyer_id, seller_id) values ('6', '2019-08-05', '2', '2', '4')", "Truncate table Items", "insert into Items (item_id, item_brand) values ('1', 'Samsung')", "insert into Items (item_id, item_brand) values ('2', 'Lenovo')", "insert into Items (item_id, item_brand) values ('3', 'LG')", "insert into Items (item_id, item_brand) values ('4', 'HP')" ], "enableRunCode": true, "enableTestMode": false, "enableDebugger": false, "envInfo": "{\"mysql\": [\"MySQL\", \"
MySQL 8.0.
mssql server 2019.
Oracle Sql 11.2.