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SQL stands for Structured Query Language. It is a standard programming language used to manage and manipulate data stored in relational databases. With SQL, you can easily create, read, update, and delete data — also known as CRUD operations.
SQL is one of the most widely used technologies in the data world, powering systems that range from small business databases to large-scale enterprise applications. It acts as the bridge between users and databases, enabling efficient communication and data handling.
Write SQL Query
The process begins when a user or an application writes an SQL command (query) such as SELECT, INSERT, UPDATE, or DELETE. This query defines what data to retrieve or modify in the database.
Send to Server
The written query is sent to the database server (like MySQL, SQL Server, or PostgreSQL). The server is responsible for managing and processing all database requests.
Execute Query
The database server parses and executes the SQL query. It checks for syntax errors, validates permissions, and accesses the necessary tables or indexes to perform the required operation efficiently.
Return Results
After execution, the server sends the results back to the user or application.
For a SELECT query, it returns the requested data.
For INSERT, UPDATE, or DELETE, it returns a message showing the number of rows affected or confirmation of success.
💾 Data Storage
SQL stores all application data in structured tables.
⚡ Efficiency
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🔒 Security
Access control ensures only authorized users can modify data
🔁 Consistency
Transactions keep data consistent even after errors.
🔁 Universality
SQL works with all major databases and technologies.
The MS SQL Server services and components include:
