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Introduction to SQL
Content
- Introduction to SQL
- What is SQL?
- Key Concepts
- Basic SQL Operations
- Example
- Updated on 10/09/2024
- 450 Views
What is SQL?
SQL stands for Structured Query Language. It is used to communicate with databases and perform various operations like querying, updating, and managing data.
Key Concepts
Database: A collection of organized data that can be easily accessed, managed, and updated. Table: A structure within a database that organizes data into rows and columns. Query: A request for data or information from a database.
Basic SQL Operations
SELECT: Retrieves data from a database. INSERT: Adds new data to a table. UPDATE: Modifies existing data in a table. DELETE: Removes data from a table.
Example
To retrieve all data from a table named employees, you would use: SELECT * FROM employees;
Activity
Write a simple SQL query to retrieve all records from a table called students.
Quiz
1. What does SQL stand for?
- a) Simple Query Language
- b) Structured Query Language
- c) Structured Quick Language
- d) Simple Quick Language
2. Which SQL command is used to retrieve data from a database?
- a) INSERT
- b) UPDATE
- c) SELECT
- d) DELETE
3. What is a table in a database?
- a) A set of data organized into columns and rows
- b) A single piece of data
- c) A command to manage data
- d) A type of database
4. How do you select all columns from a table named products?
- a) SELECT all FROM products;
- b) SELECT * FROM products;
- c) GET * FROM products;
- d) FETCH * FROM products;
5. Which command would you use to add new data to a table?
- a) SELECT
- b) INSERT
- c) UPDATE
- d) DELETE