SQL Interview Questions #44: Define RDB Index

SQL code copied to buffer

Task 44:

Select the correct relational database index definition from the options below:

An index is a built-in search function within the database software.

An database index is a duplicate copy of a table stored in a separate location for backup purposes.

An index is a mandatory component for every table in a database.

An database index is an arranged data structure that allows the database to locate relevant data on storage based on the values of the indexed columns without scanning the entire table. In most cases, an index speeds up data retrieval but slows down data modification by adding the cost of updating the index itself.

Mark all correct answers and click the "Check!" button

Support SQLtest.online

This project has only one funding source: your donations. The monthly maintenance cost is $100.

Last month I added a new MariaDB database with a preloaded University DB, 9 new questions, and refactored many questions and lessons.

With your support, I plan to continue this work: write new lessons and tasks, and improve existing lessons.

To keep the project running next month, we need to collect at least this amount by the end of this month. Anything above it goes to new lessons, exercises, and features.

Received: $29.58 Goal: $100.00

Progress: 30%

SQL in 10 Minutes a Day by Ben Forta

Whether you're an application developer, database administrator, web application designer, mobile app developer, or Microsoft Office users, a good working knowledge of SQL is an important part of interacting with databases. And Sams Teach Yourself SQL in 10 Minutes offers the straightforward, practical answers you need to help you do your job.

Login

Register