What is SELF JOIN and when would you use it?
A SELF JOIN is a type of SQL join where a table is joined with itself. Essentially, it allows you to combine rows from the same table based on a...
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Clustered vs. Non-Clustered Index in SQL – A Complete Guide with Real-Time Analogy
🧠 What is an Index in SQL? An index in SQL is like a table of contents in a book. It helps the database engine find rows faster without scanning...
Types of Keys in SQL with Key Differences: Primary Key vs. Foreign Key, and More
In relational database design, keys play a critical role in uniquely identifying records and establishing relationships between tables. Below are the different types of keys used in SQL: 1. Primary...
