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𝐒𝐐𝐋 𝐐𝐮𝐞𝐫𝐢𝐞𝐬 𝐭𝐨 𝐏𝐫𝐚𝐜𝐭𝐢𝐜𝐞 𝐚𝐬 𝐚 𝐛𝐞𝐠𝐢𝐧𝐧𝐞𝐫 :
SQL is an essential tool for data scientists, providing them with the ability to access, retrieve, manipulate, and analyze large amounts of data quickly and efficiently. Its integration with other data science tools makes it an essential part of the data science toolkit.
𝐇𝐞𝐫𝐞 𝐚𝐫𝐞 𝐟𝐞𝐰 𝐒𝐐𝐋 𝐪𝐮𝐞𝐫𝐲 𝐪𝐮𝐞𝐬𝐭𝐢𝐨𝐧𝐬 𝐭𝐨 𝐩𝐫𝐚𝐜𝐭𝐢𝐜𝐞
1. Write a SQL query to retrieve all the data from the "customers" table and get the number of rows
2. Write a SQL query to retrieve the distinct values of the "name" column in the "customers" table.
3. Write a SQL query to retrieve the maximum, minimum, sum and average value from the "age" column in the "customers" table.
4. Write a SQL query to retrieve the rows in the "customers" table where the "name" column equals "John".
5. Write a SQL query to retrieve the rows in the "customers" table where the "age" column is between 18 and 30.
6. Write a SQL query to retrieve the rows in the "customers" table where the "id" column is in the list (1, 2, 3, 4).
7. Write a SQL query to retrieve the rows in the "customers" table where the "address" column is not null.
8. Write a SQL query to retrieve the total number of orders for each customer in a table, where the customer data is stored in a separate table.
9. Write a SQL query to retrieve the average order value for each customer in a table, where the customer and order data are stored in separate tables.
10. Write a SQL query to retrieve the top 10 customers by total order value, where the customer and order data are stored in separate tables.
11. Write a SQL query to retrieve the number of orders for each customer in a table, where the customer and order data are stored in separate tables, and the orders were placed in the last month.
12. Write a SQL query to retrieve the total value of orders for each customer in a table, where the customer and order data are stored in separate tables, and the orders were placed in the last year.
13. Write a SQL query to retrieve the top 5 products by total sales value, where the product and sales data are stored in separate tables.
14. Write a SQL query to retrieve the number of orders for each product in a table, where the product and order data are stored in separate tables.
15. Write a SQL query to retrieve the total value of orders for each product in a table, where the product and order data are stored in separate tables, and the orders were placed in the last month.
16. Write a SQL query to retrieve the number of customers who have placed orders in the last month, where the customer and order data are stored in separate tables.
17. Write a SQL query to retrieve the number of orders for each customer, where the customer and order data are stored in separate tables, and the total order value for each customer is in the top 10% of all customers.
#datascientists #datascience #sql #data
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