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About the test

The SQL online test assesses candidates' knowledge of SQL queries and relational database concepts, such as indexes and constraints.

It's an ideal test for pre-employment screening. A good database admin, back-end developer, or data analyst all need a solid understanding of SQL to interface and access an SQL database efficiently.

This online test requires candidates to write SQL queries that extract, combine, and manipulate data.

Sample public questions

Easy
3 min
code
Public
SQL
Aggregation
Select

Given the following data definition, write a query that returns the number of students whose first name is John.

TABLE students
   id INTEGER PRIMARY KEY,
   firstName VARCHAR(30) NOT NULL,
   lastName VARCHAR(30) NOT NULL
Easy
5 min
code
Public
SQL
Conditions
Update

A table containing the students enrolled in a yearly course has incorrect data in records with ids between 20 and 100 (inclusive).

TABLE enrollments
  id INTEGER NOT NULL PRIMARY KEY
  year INTEGER NOT NULL
  studentId INTEGER NOT NULL

Write a query that updates the field 'year' of every faulty record to 2015.

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40 more premium SQL questions

Roads, Authors, Autocomplete, Bank Branches, Cheapest Product, Countries, Developers, Hospital Patients, Index Performance, Menu Items, Movies, Projects, Rectangles, Restaurant Menu, Retirees, SMS Messages, Poll, Users and Accounts, Matching Clothes, Agents, Sales, Employee Manager, Auto Show, Delete Orders, Welfare Organization, Tasks, Manager Sales, Student Rankings, Student Activities, Youngest Child, Movies Live, Department Report, Ingredients, Average Salary, Movie Genres, River Discharge, ATM Locations, Transactions, Merge Stock Index, Ban Users.

Skills and topics tested

  • SQL
  • Conditions
  • Views
  • Select
  • Create Index
  • Database Schema
  • Performance Tuning
  • Constraints
  • Create Table
  • Aggregation
  • Subqueries
  • Ordering
  • Bug Fixing
  • Indexes
  • Alter Table
  • Group by
  • Update
  • Insert
  • Joins
  • Left Join
  • Right Join
  • Delete
  • SQL CASE
  • Union
  • CTE
  • Database Normalization

For job roles

  • Data Analyst
  • Database Administrator
  • SQL Developer

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