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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

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