Chapter Overview
This chapter introduces Structured Query Language (SQL), a powerful and standardized language used to create, manage, and manipulate relational databases. Students will learn about SQL syntax, data types, constraints, and key categories of SQL commands like DDL, DML, and DQL. The chapter covers SELECT queries, filtering, sorting, aggregate functions, and joins with examples and practical applications.
Important Keywords
- SQL: Structured Query Language used for managing relational databases.
- DDL: Data Definition Language (e.g., CREATE, ALTER, DROP).
- DML: Data Manipulation Language (e.g., INSERT, UPDATE, DELETE).
- DQL: Data Query Language (e.g., SELECT).
- Constraints: Rules applied to columns (e.g., PRIMARY KEY, NOT NULL).
- Aggregate Functions: Functions like COUNT(), SUM(), AVG(), MAX(), MIN().
- JOIN: A clause used to combine records from two or more tables.
Detailed Notes
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