11 interview questions on SQL Data Designfor developers (2026)

Test your technical skills before an interview of SQL Data Design with 11 corrected questions. Beginner, Intermediate or Expert level.

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11 questions

Hard

2 votes667 runs0 comment

Write a SQL query to get the average of the number of orders per customer.

Data Scientist

sql

error

Clément Devosat Dec 2, 2021

Expert

1 vote719 runs

2 comments

A primary key can be represented on multiple columns.

Data Scientist

primary key

foreign key

Inconnuat Apr 18, 2023

Easy

1 vote702 runs1 comment

Write a SQL query to get the total amount of orders.

Data Scientist

sql

table

Clément Devosat Dec 2, 2021

Hard

1 vote680 runs0 comment

Write a SQL query to get the number of rows in the table `users`

Data Scientist

sql

join

Clément Devosat Dec 2, 2021

Easy

1 vote673 runs0 comment

Write a SQL query to get the name of all the employees who are in the sales department.

Data Scientist

sql

join

Inconnuat Dec 2, 2021

Hard

0 vote682 runs0 comment

Create a new table called notes and insert the notes into the table commande

Data Scientist

sql

database

Clément Devosat Dec 2, 2021

Hard

0 vote680 runs1 comment

Which of the following SQL queries will return the same result? A: SELECT * FROM table WHERE id = 1; B: SELECT * FROM table WHERE id = 1 ORDER BY id;

Data Scientist

sql

join

Clément Devosat Dec 2, 2021

Hard

0 vote675 runs0 comment

SQL query to get the number of orders per customer

Data Scientist

sql

diagram

Clément Devosat Dec 2, 2021

Hard

0 vote675 runs1 comment

Write a SQL query to get the total amount of orders for each customer.

Data Scientist

sql

notes

Clément Devosat Dec 2, 2021

Medium

-1 vote723 runs

2 comments

Write a SQL query to get the number of rows in the table `users`.

Data Scientist

sql

joins

Clément Devosat Dec 2, 2021

Easy

-1 vote718 runs1 comment

Can we add a foreign key to the table `users` on the column `id`?

Data Scientist

sql

database

Clément Devosat Dec 2, 2021