What is SQL?
SQL, or Structured Query Language, is a programming language used to manage and manipulate relational databases. It provides a standardized way to interact with databases, allowing users to query, insert, update, and delete data seamlessly.

Why SQL is Important for Data Management?
SQL plays a vital role in data management due to the following reasons:

It enables efficient retrieval and organization of data from large databases.
SQL allows users to perform complex queries and aggregations to derive meaningful insights.
It ensures data integrity through constraints and transactions.
SQL is widely used across various industries for data analysis, reporting, and decision-making.
Common SQL Interview Questions
What is a Database Management System (DBMS)?
A Database Management System (DBMS) is software that facilitates the creation, modification, and administration of databases. It provides an interface for users and applications to interact with the database and ensures data integrity, security, and concurrency.

What are the Different Types of SQL Statements?
SQL statements can be broadly categorized into the following types:

Data Manipulation Language (DML): Used to retrieve, insert, update, and delete data in the database. Examples include SELECT, INSERT, UPDATE, and DELETE.

Data Definition Language (DDL): Used to define and manage the structure of the database objects. Examples include CREATE, ALTER, and DROP statements.

Explain the Difference Between SQL and NoSQL Databases
SQL and NoSQL databases differ in their data models and storage structures. SQL databases are relational, meaning data is stored in tables with predefined schema and relationships, while NoSQL databases are non-relational and store data in flexible formats like key-value pairs, documents, or graphs.

What are Primary Keys and Foreign Keys in SQL?
A primary key is a unique identifier for each record in a table, ensuring data integrity and uniqueness. On the other hand, a foreign key establishes a relationship between two tables, referencing the primary key of another table to maintain referential integrity.

How to Perform CRUD Operations in SQL?
CRUD stands for Create, Read, Update, and Delete, which are the basic operations performed on data in a database. To perform CRUD operations in SQL, you would use the following SQL statements:

Create: INSERT INTO table_name (column1, column2, ...) VALUES (value1, value2, ...);
Read: SELECT column1, column2, ... FROM table_name WHERE condition;
Update: UPDATE table_name SET column1 = value1, column2 = value2, ... WHERE condition;
Delete: DELETE FROM table_name WHERE condition;