Write an SQL query to find the second highest salary.
Here is a blog post based on the outline above. Find the Second Highest Salary in SQL Imagine you're an HR mana…
What are indexes in SQL? Clustered vs non-clustered.
Understanding SQL Indexes: Clustered vs. Non-Clustered I. Introduction Imagine searching for a specific product on …
What is a composite key?
Understanding Composite Keys in Database Design Imagine you're building a database for an online store. You need…
Difference between candidate key and super key.
```html Understanding Candidate Keys and Super Keys in Databases Ever wondered about the choices you make when desi…
What is a foreign key constraint?
What is a Foreign Key Constraint? A Comprehensive Guide Imagine you're building a website for an online store. Yo…
TCS
What is a primary key vs unique key?
Primary Key vs. Unique Key in Databases: A Clear Explanation I. Introduction Relational databases use primary key…
TCS
What is denormalization? Why is it used?
What is Denormalization? Why Should You Care? Imagine trying to find a single customer's order history across mul…
