SQL Practice is a comprehensive list of practice questions, to take you from beginner to expert in SQL. It is all the training you need to crack Data Science interviews at top companies.
| Question | Difficulty |
|---|---|
| Power users of messages | Medium |
| Messages by an user | Easy |
| More than one message? | Hard |
| Messages from a sender | Beginner |
| Count the total number of messages sent | Beginner |
| Messages sent after a certain time | Hard |
| Who sent the last message? | Medium |
| Profit margin of each product | Medium |
| Profit for each product | Medium |
| Higher than average profit | Hard |
| Average Sale price | Easy |
| Highest Selling Items | Beginner |
| Customers with more than one purchase | Medium |
| Products that were never purchased | Medium |
| Total money spent by each customer | Medium |