sqlpractice.co.in

Run code

Practice

Practise by writing real programs

100 exercises across 6 languages. Each one gives you a small, realistic task, a starter file and test cases; your program is run against every test and you see exactly where it differs. Progress stays in this browser.

SQL

All SQL exercises →

Look at the whole product catalogueEasy
The sales team wants to see everything we sell. Return every column of every row in the Products table.
SQLFoundationsNot started
Just the names and pricesEasy
For a price list, return only the name and unit_price of every product — nothing else.
SQLFoundationsNot started
Find the expensive productsEasy
Finance wants a list of products that cost more than 400. Return all columns for those products only.
SQLFoundationsNot started
Who earns the most?Easy
Return the first_name, last_name and salary of every employee, with the highest earner first and the lowest earner last.
SQLFoundationsNot started
The three priciest itemsEasy
Return the name and unit_price of just the three most expensive products, most expensive first.
SQLFoundationsNot started
Which countries do we sell to?Easy
Marketing wants a de-duplicated list of the countries our customers are based in. Return each country exactly once, in a single column named country.
SQLFoundationsNot started
Active engineers onlyEasy
HR needs the first_name and last_name of employees who are in department 10 and are currently active (active = 1). Both conditions must hold.
SQLFoundationsNot started
Our best-tier customersEasy
Return the company and tier of every customer whose tier is either Gold or Platinum.
SQLFoundationsNot started
Companies beginning with AMedium
Return the company name of every customer whose company name starts with the letter A.
SQLFoundationsNot started
Who reports to nobody?Medium
Department heads have no manager, so their manager_id is empty. Return the first_name and last_name of every employee with no manager.
SQLFoundationsNot started
How many customers do we have?Easy
Return a single row with a single column named total_customers holding the number of rows in the Customers table.
SQLGrouping & JoinsNot started
Average salary, roundedEasy
Return the average employee salary rounded to the nearest whole number, in one column named avg_salary.
SQLGrouping & JoinsNot started
Cheapest and dearestEasy
In one row, return the lowest unit_price as min_price and the highest as max_price from the Products table.
SQLGrouping & JoinsNot started
Revenue actually shippedMedium
Cancelled and pending orders should not count as revenue. Return the sum of order_total for orders with status 'Shipped', in one column named shipped_revenue.
SQLGrouping & JoinsNot started
Headcount per departmentMedium
Return each dept_id alongside the number of employees in it, with the count in a column named headcount.
SQLGrouping & JoinsNot started
Biggest departments firstMedium
Return dept_id and headcount as before, but sort so the department with the most employees comes first.
SQLGrouping & JoinsNot started
Only the multi-person departmentsMedium
Return dept_id and headcount for departments that contain more than two employees.
SQLGrouping & JoinsNot started
Put a name to the departmentMedium
Employees only store a dept_id. Return each employee's first_name and last_name next to their dept_name by joining to the Departments table.
SQLGrouping & JoinsNot started
Every department, even the quiet onesHard
Return every dept_name together with how many employees it has, named headcount. Departments with no employees at all must still appear, showing a count of 0.
SQLGrouping & JoinsNot started
Label each order by sizeHard
Return order_id, order_total, and a column named size_band that reads 'Large' when order_total is 8000 or more, 'Medium' when it is at least 3000 but under 8000, and 'Small' otherwise.
SQLGrouping & JoinsNot started
Better paid than averageMedium
Return the first_name, last_name and salary of every employee earning more than the company-wide average salary.
SQLAdvanced QueriesNot started
Customers with a shipped orderMedium
Every customer has ordered something, but not every order ships. Return the company name of each customer who has had at least one order reach 'Shipped' status.
SQLAdvanced QueriesNot started
Customers still waitingMedium
Now the exact opposite: return the company name of each customer who has never had an order ship — everything they ordered is still pending or was cancelled.
SQLAdvanced QueriesNot started
Name the managerHard
Return each employee's first_name alongside their manager's first_name in a column named manager_name. Employees with no manager should be left out.
SQLAdvanced QueriesNot started
One combined contact listMedium
Build a single two-column list of everyone we deal with. Return each employee's first_name and each customer's contact under a shared column named person_name, plus a column named source containing 'Employee' or 'Customer' as appropriate.
SQLAdvanced QueriesNot started
Revenue by product categoryHard
Return each product category alongside the total order_total it has generated from shipped orders only, in a column named category_revenue, highest revenue first.
SQLAdvanced QueriesNot started
Who is closing the deals?Hard
Return the first_name and last_name of each employee together with how many orders they handled, in a column named orders_handled, counting shipped orders only, and listing the busiest employee first. Only include employees who handled at least one shipped order.
SQLAdvanced QueriesNot started
Big spendersHard
Return company and the total spend as total_spent for every customer whose combined order_total across all their orders exceeds 10000, largest spender first.
SQLAdvanced QueriesNot started
Label the price bandsEasy
Marketing wants each product labelled. Return name, unit_price, and a column called price_label that says premium for products costing 500 or more and standard for everything else.
SQLExpressions & ReportsNot started
Support levels by tierEasy
Support triages customers by tier. Return company, tier, and support_level: Platinum customers get 'Top priority', Gold customers get 'Standard support', and everyone else gets 'Self-serve'.
SQLExpressions & ReportsNot started
One-row status reportMedium
Management wants the order pipeline on a single row: three columns named shipped, pending and cancelled, each counting the orders with that status.
SQLExpressions & ReportsNot started
Revenue won and lostHard
For each employee who has handled orders, return first_name, shipped_revenue (total order_total of their Shipped orders) and cancelled_revenue (total of their Cancelled orders), highest shipped_revenue first.
SQLExpressions & ReportsNot started
Mailing labelsEasy
HR needs mailing labels: a single column full_name (first name, a space, last name) plus email, for every employee, alphabetical by full_name.
SQLExpressions & ReportsNot started
Case-insensitive searchEasy
A colleague types 'an' into the customer search box and expects every company whose name contains those two letters, whether they are stored in upper or lower case - so 'Andes' counts as well as 'Meridian'. Return company.
SQLExpressions & ReportsNot started
Strip the domainMedium
For the Engineering department (dept_id 10), return each employee's email and a column mailbox holding the email with '@example.com' removed.
SQLExpressions & ReportsNot started
The longest product namesMedium
The catalogue layout breaks on long names. Return name and name_length for every product whose name is 18 characters or longer.
SQLExpressions & ReportsNot started
Who reports to whomMedium
List every employee's first_name alongside reports_to - their manager's first name, or the text 'No manager' for employees at the top of the tree.
SQLExpressions & ReportsNot started
Orders by monthMedium
How does order volume spread across the year? Return order_month (the month number from order_date) and orders (how many orders that month), earliest month first.
SQLExpressions & ReportsNot started
Big orders, with namesMedium
Define a CTE called big_orders that selects orders with order_total above 3000, then return order_id, company and order_total for those orders.
SQLExpressions & ReportsNot started
Well-paid departmentsHard
Using a CTE that computes each department's average salary, return dept_name and avg_salary for the departments whose average exceeds 100000.
SQLExpressions & ReportsNot started
Two CTEs, one reportHard
Build a per-salesperson report using two CTEs: one counting each employee's Shipped orders, one totalling each employee's revenue across all orders. Return first_name, shipped_orders and revenue, highest revenue first.
SQLExpressions & ReportsNot started
Category revenue reportHard
The quarterly report needs revenue by product category, ignoring cancelled orders: return category, orders (count) and revenue (sum of order_total), biggest revenue first.
SQLExpressions & ReportsNot started

Python

All Python exercises →

JavaScript

All JavaScript exercises →

C#

All C# exercises →

Rust

All Rust exercises →

PHP

All PHP exercises →