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SQL Tests

    • 19 tests |
    • 271 questions

Master SQL essentials and boost your data prowess with our focused SQL test suite.

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Sample SQL Assessments question Test your knowledge!

When performing a LEFT JOIN between 'orders' and 'customers' tables on the 'customer_id' field, which statement is TRUE?

  • All records from the 'orders' table and only the matching records from the 'customers' table will be included.
  • All records from the 'customers' table and only the matching records from the 'orders' table will be included.

To fetch a list of product names and the total quantity sold for each, given tables `Products` with `ProductID` and `ProductName`, and `OrderDetails` with `ProductID` and `Quantity`, what SQL statement would you use?

  • SELECT Products.ProductName, SUM(OrderDetails.Quantity) FROM Products INNER JOIN OrderDetails ON Products.ProductID = OrderDetails.ProductID GROUP BY Products.ProductName
  • SELECT ProductName, SUM(Quantity) FROM OrderDetails GROUP BY ProductID
  • SELECT ProductName, COUNT(*) FROM Products JOIN OrderDetails ON Products.ProductID = OrderDetails.ProductID GROUP BY ProductName
  • SELECT Products.ProductName, TOTAL(OrderDetails.Quantity) FROM Products LEFT JOIN OrderDetails ON Products.ProductID != OrderDetails.ProductID GROUP BY Products.ProductName
  • SELECT ProductName, AVG(Quantity) FROM Products, OrderDetails WHERE Products.ProductID = OrderDetails.ProductID GROUP BY ProductName

What is the result of the following SQL query against a table `Transactions` which has a `TransactionID`, `UserID`, `Amount`, and `Timestamp`: `SELECT UserID, COUNT(TransactionID) as NumberOfTransactions, AVG(Amount) as AverageAmount FROM Transactions WHERE Timestamp >= '2023-01-01' AND Timestamp < '2023-02-01' GROUP BY UserID HAVING COUNT(TransactionID) > 3;`?

  • It returns the UserID, number of transactions, and average transaction amount for each user with more than three transactions in January 2023.
  • It returns the total number of transactions for each UserID where the number of transactions is greater than three between January and February 2023.
  • It returns the average amount of all transactions that occurred in January 2023 for UserIDs with more than three transactions.
  • It returns UserIDs that have made exactly three transactions in January 2023 and the total average amount for all users.
  • It returns UserIDs and the sum of amounts for transactions made by users in January 2023, with no limitation on the count of transactions.

Consider a scenario where a banking database transaction logs are being analyzed. A query needs to select the account number, type, and transaction amount for all transactions that are in the top 5% of the highest amounts. Which SQL window function should be utilized?

  • RANK()
  • NTILE(20) OVER (ORDER BY transaction_amount DESC)
  • ROW_NUMBER()
  • COUNT()

A database normalization process requires minimizing redundancy and dependency by ensuring that only related data is stored in a table. Which normal form is primarily designed to reduce anomalies created by transitive dependencies?

  • First Normal Form (1NF)
  • Second Normal Form (2NF)
  • Third Normal Form (3NF)
  • Boyce-Codd Normal Form (BCNF)

Given a table 'employees' with fields 'EmployeeID', 'LastName', and 'DepartmentID', which query will return the count of employees in each department?

  • SELECT COUNT(EmployeeID), DepartmentID FROM employees GROUP BY DepartmentID;
  • SELECT DepartmentID, COUNT(*) FROM employees SORT BY DepartmentID;
  • COUNT(SELECT * FROM employees) GROUP BY DepartmentID;
  • SELECT DepartmentID FROM employees COUNT(EmployeeID);

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SQL Assessments Tips

1Understand the SQL Basics

Start with a solid foundation. Ensure you’re proficient in basic SQL commands and syntax.

2Practice Makes Perfect

The more you code, the better you get. Regular practice is key to acing SQL tests.

3Time Management is Crucial

Learn to manage your time effectively. Practice answering questions under timed conditions.

4Free Practice Tests Available

You can take free practice tests on Practice Aptitude Tests to get a real feel of the SQL tests ahead of your job application.

5Review Real SQL Case Scenarios

Study real-world SQL use cases to understand how theory translates into practice.

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SQL Assessments FAQs

What is covered in these tests?

SQL tests cover data definition language (DDL), data manipulation language (DML), and data control language (DCL) operations, as well as transaction control commands. Expect questions on querying data, joins, subqueries, indexes, and views.

How do I prepare for SQL tests?

Preparing for SQL tests demands a mix of studying SQL concepts and hands-on practice. Review database theory, practice writing queries, and use online resources to test your knowledge under timed conditions.

Will these tests help me find a job?

While no single factor guarantees a job, excelling in SQL tests can significantly enhance your marketability to employers seeking data proficiency. These tests validate your technical skills, aligning you with job requirements.

How do employers use these tests?

Employers use SQL tests to evaluate a candidate’s ability to handle databases, ensuring they can effectively analyze data and support data-driven decision-making processes within the organization.

Where can I practice free SQL test questions?

The best way to prepare for SQL tests is by practicing. Practice Aptitude Tests offers a variety of free SQL test questions, making it an ideal platform for preparation.