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About the test

The Python and SQL online test assesses candidates' knowledge of programming in the Python language and their ability to use SQL.

It's an ideal test for pre-employment screening. A good Python developer needs to be able not only to solve problems using Python but also to write and analyze SQL queries to access a database.

This online test requires candidates to solve coding problems in Python and to write SQL queries that extract, combine, and manipulate data.

Sample public questions

A three-node binary tree.Binary search tree (BST) is a binary tree where the value of each node is larger or equal to the values in all the nodes in that node's left subtree and is smaller than the values in all the nodes in that node's right subtree.

Write a function that, efficiently with respect to time used, checks if a given binary search tree contains a given value.

For example, for the following tree:

  • n1 (Value: 1, Left: null, Right: null)
  • n2 (Value: 2, Left: n1, Right: n3)
  • n3 (Value: 3, Left: null, Right: null)

Call to contains(n2, 3) should return True since a tree with root at n2 contains number 3.

Python
Algorithmic Thinking
Recursion
Tree
Easy
15 min
code
Public

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
SQL
Aggregation
Select
Easy
3 min
code
Public

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49 more premium Python Algorithms and SQL questions

  Roads,   Authors,   Autocomplete,   Ban Users,   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,   Veterinarian,   Book Sale,   Unique Numbers,   Moving Total,   Max Sum,   Internal Nodes,   Paper Strip,   Friend,   Flight Connections,   Merge Stock Index.

Skills and topics tested

  • SQL
  • Conditions
  • Views
  • Select
  • Create Index
  • Database Schema
  • Performance Tuning
  • Alter Table
  • Constraints
  • Create Table
  • Aggregation
  • Subqueries
  • Ordering
  • Bug Fixing
  • Indexes
  • Group by
  • Update
  • Insert
  • Joins
  • Left Join
  • Right Join
  • Delete
  • SQL CASE
  • Union
  • CTE
  • Database Normalization
  • Python
  • Algorithmic Thinking
  • Queue
  • Dictionary
  • Sorting
  • Set
  • Lists
  • Tree
  • Graphs

For job roles

  • Back-End Developer
  • Data Analyst
  • Python Developer
  • SQL Developer
  • Web Developer

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