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.

or

11 questions

Hard

2 votes665 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 vote717 runs

2 comments

A primary key can be represented on multiple columns.

Data Scientist

primary key

foreign key

Inconnuat Apr 18, 2023

Easy

1 vote700 runs1 comment

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

Data Scientist

sql

table

Clément Devosat Dec 2, 2021

Hard

1 vote678 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 vote671 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 vote680 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 vote678 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 vote673 runs0 comment

SQL query to get the number of orders per customer

Data Scientist

sql

diagram

Clément Devosat Dec 2, 2021

Hard

0 vote673 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 vote721 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 vote716 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