for Data Enthusiasts
Post views are being analysed using post_views table. This table contains information of all views on each posts date wise.Task is to find all authors who viewed at least one of their own posts. Sort the final output by their author_id in ascending order. Input Table: post_views post_id author_id viewer_id view_date 22 2 4 … Read more
Write a SQL query that selects the product id, sale year, quantity, and price for the first year of every product sold. Input Table : sales sale_id product_id sale_year quantity price 20 80 2017 21 300 30 80 2018 23 400 40 13 2019 56 600 Output Table: product_id first_year quantity price 80 2017 21 300 13 … Read more
A multinational Company is going through very bad timings and now want to focus on products which has shown increased sales and profit every year. They are looking for your help in identifying such products so that they can plan marketing campaign accordingly. Input Table – Product_sales sale_year product_id units_sold 2016 1 1000 2016 2 … Read more
Write an SQL query that reports the total quantity sold for every product id. Input Table : sales sale_id product_id sale_year quantity price 20 80 2017 21 300 30 80 2018 23 400 40 13 2019 56 600 Output Table: product_id total_quantity 80 44 13 56 Explanation: product_id is Foreign Key and … Read more
Write an SQL query that reports all product names of products in the “sales” table along with their selling year and price. Input Table : sales sale_id product_id sale_year quantity price 20 80 2017 21 300 30 80 2018 23 400 40 13 2019 56 600 Input Table: product product_id product_name 80 Asus … Read more
Points of x coordinates are stored in table “points“. All entries of these points in table are integers and unique. Write a query to find shortest distance between two points on x-axis. Input Table: points x-axis -3 -6 0 10 Output Table: shortest 3 Explanation: All possible combinations of all points in input table … Read more
Tables – product and sales are provided. Being area manager, you are looking for best seller by total sales price to reward and motivate them for best results. If there is a tie, all sellers would be qualified for same reward. Write SQL query to fetch all seller_id by total sale price. Input Table: sales … Read more
Tables – product and sales are provided. product table holds data of all products and sales table represent sale transaction that was completed. Write SQL query to identify buyer_id who bought S10 but not iPhone. Input Table: sales seller_id product_id buyer_id sale_date quantity price 11 10 71 2019-02-22 3 6000 11 20 72 2019-03-27 1 600 … Read more
Tutor data is provided tutor_students table below. Table contains data of a month with tutor_id and student_id along with date of month on which tutor took class.Write a SQL query that provides the pairs (tutor_id, student_id) where the tutor has taken at least 3 classes for a student in single month. Input Table: tutor_students … Read more
Write an SQL query and identify first login date for each gamer. Input Table: gamers_activity player_id device_id event_date games_played 7 22 2017-04-02 4 7 22 2017-06-05 3 9 33 2018-02-26 0 6 11 2017-05-07 7 6 44 2019-08-06 3 Output Table: player_id first_login 7 2017-04-02 9 2017-04-02 6 2017-04-02 Explanation: “gamers_activity” table shows the activity … Read more