What is UNIQUE KEY constraint?

Interview Questions

1. What is UNIQUE KEY constraint?

Unique key is a set of one or more fields/columns of a table that uniquely identify a record in database table. It is like Primary key but it can accept only one null value and it cannot have duplicate values.

By Hena Parveen 2 0

Is this helpful? Yes No

Submit an interview question

Submitted questions and answers are subject to review and editing, and may or may not be selected for posting, at the sole discretion of w3Sniff.

Get Started

Comments

Check out more interview questions

Based on your skills

MS SQL Server

1702261 1720 23 859

Angular

43950 92 0 46

Wordpress

35443 72 1 36

See all skills

Home

Snippet

Interview

Take control of your digital experience now!
Say goodbye to ads and welcome the ad-free version of w3sniff.

Get a smooth and uninterrupted experience.
Stop all kinds of promotional stuff.
Eliminate annoying hassles and interference.
Switch plans or cancel your subscription anytime.

100% Ads-Free experience

$1.99 $0.99 / month

Pay with PayPal

FAQs

After subscribing to this plan you will not see any AdSense. All the tools page will be free from any kind of promotional stuff and you can do your work without any disturbance.

Yes, it will be auto-renewed until you cancel it by yourself.

TThe validity of this plan is 30 days. After that, you will be billed for the new month.

You can manually cancel the membership from your account or request us to do so.

No, the payment of this subscription is non-refundable.