What is SQL Constraints? | Key Interview Questions Answered

In this SQL tutorial, we're diving deep into the world of constraints. SQL constraints play a crucial role in maintaining data integrity and accuracy. Whether you're preparing for an interview or looking to level up your SQL skills, we've got you covered.We'll answer key interview questions about constraints, such as the difference between Primary Key and Unique Key, the types of constraints in SQL, and the significance of Primary and Foreign Keys. Plus, we'll tackle the question of whether you can have multiple constraints on a single column in SQL.Understanding these concepts is not only essential for acing interviews but also for building reliable, high-quality databases. So, let's master SQL constraints together! Don't forget to like, subscribe, and share our channel for more insightful tech content. Your support keeps us motivated to create engaging videos like this one.
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[@punitvlog1934]

But I do in Oracle database. Unique key hold multiple null values. But y u r told only one ??

[@TechAndTalkConnect]

Thank you for your comment! I understand the confusion. In the video you're referring to, I was discussing Oracle databases, where unique key constraints indeed allow multiple null values. However, in my MSSQL video, I demonstrated that unique key constraints in MSSQL do not permit multiple null values. Each database management system can have its own rules, and I appreciate your observation. If you have any questions or need further clarification on MSSQL or any other topic, feel free to ask. I'm here to help! 😊 Please check out the video I have explained the same topic practically kzbin.info/www/bejne/hmi7eomur7Rppck