Test SQL Data Design
Test SQL with answers to assess your knowledge and prepare for job interviews. Assess your technical level in 20 minutes.
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Test details
SQL (acronym for Structured Query Language) is a standardized computer language used to use relational databases. The data manipulation language part of SQL allows you to find, add, modify or delete data in relational databases.
Creating a robust and scalable database is a complex subject that requires experience and basic knowledge.
This test is based on a concrete example of a customer who wishes to implement a database and will validate your skills on these subjects:
- Good practices
- Diagrams
- Joins
- Redundancy
- Data consistency
Test author : Clément Devos
This quiz was designed by WeLoveDevs.com team.
Sample question
THIS BLOCK IS THE SAME FOR ALL QUESTIONS
You must design a landscaper marketplace.
A person can register as a landscaper. She then chooses the services she offers from a pre-established list. She then declares - by selecting on a calendar - her availability (a start date and an end date, the days are always whole).
Another person can register on the site as a client. She can then select the service or services she is looking for. A list of landscapers is then presented to her with a filter that allows only landscapers available for certain days / periods to be presented.
If the client finds an adequate landscaper, he can then select the dates he actually needs and then place an order.
All quiz questions refer to this problem.
####Two important constraints are added to answer the questions:
No data redundancy is tolerated.
We will consider the storage of structured data (table, hash, json, etc.) in a single data field impossible.
In the relationship between clients and orders, the foreign key is located
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