𝗠𝗮𝘀𝘁𝗲𝗿 𝗦𝗤𝗟 𝗳𝗼𝗿 𝗜𝗻𝘁𝗲𝗿𝘃𝗶𝗲𝘄𝘀, 𝗙𝗮𝘀𝘁!

Here are 10 must-know SQL concepts:

● Stored Procedure vs. Function
Procedures allow DML; functions handle calculations only.

● Clustered vs. Non-Clustered Index
Clustered sorts data physically; non-clustered creates pointers.

● DELETE vs. TRUNCATE
DELETE is row-specific; TRUNCATE clears all rows fast.

● WHERE vs. HAVING
WHERE filters rows; HAVING filters after GROUP BY.

● Primary Key vs. Unique Key
Primary is unique & non-null; Unique allows one null.

● JOIN Types
INNER, LEFT, RIGHT, FULL JOIN—combine tables in different ways.

● Normalization Forms
Minimizes redundancy and improves data integrity.

● ACID Properties
Ensures reliable transactions with Atomicity, Consistency, Isolation, Durability.

● Indexes
Speeds up data retrieval; careful use is key.

● Subqueries
Nest queries within queries for flexible data retrieval.

Master these, and you’re SQL-interview ready!