Database Administration and SQL Online Test

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About the test

The Database Administration and SQL online test assesses knowledge of database management systems and SQL skills through a series of live coding tasks that require writing SQL queries. 

The assessment includes work-sample tasks such as:

  • Monitoring database performance, troubleshooting issues, recovering data from a backup, and other database administration tasks.
  • Writing queries and subqueries that join, group, filter, and aggregate data.
  • Creating new database tables with proper table schema and constraints.

A good database admin, back-end developer, or SQL developer all need a solid understanding of Database Administration procedures to effectively store and organize data, as well as SQL to interface and access an SQL database efficiently.

Sample public questions

Easy
5 min
mca
Public
Database Administration
Backup

Under a new database backup plan:

  • Full backups of the database are taken every 6 hours starting at 00:00.
  • Differential backups are taken every 1 hour starting at 01:00, except for intervals of 6 hours (when full backups are taken).
  • Transaction/redo log backups are taken every 30 minutes starting at 00:00. The transactional/redo log is reset/cleared after a backup is taken.

Due to a missed scenario during the testing phase, a development error in setting wrong query conditions resulted in the loss of all records from a table at 13:45, which had data prior to the implementation of the backup plan. All further backups were taken as per the mentioned schedule.

A diagram showing the backup schedules

Select all the ways to restore the database until 13:45.

Easy
7 min
code
Public
SQL
Aggregation
Group by
Select

App usage data are kept in the following table:

TABLE sessions
  id INTEGER PRIMARY KEY,
  userId INTEGER NOT NULL,
  duration DECIMAL NOT NULL

Write a query that selects userId and average session duration for each user who has more than one session.

See the example case for more details.

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43 more premium Database Administration and 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, Database Storage Space, Index Fragmentation, Master Slave, 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
  • Database Administration
  • Database Logs
  • Server Clustering

For job roles

  • Database Administrator
  • SQL Developer

Sample candidate report

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