Structured Query Language (SQL) - Part 1
Structured Query Language (SQL) serves as the foundational tool for managing relational databases, allowing users to define, manipulate, and control access to data. The chapter focuses on the Data Definition Language (DDL) commands like CREATE TABLE, ALTER TABLE, and DROP TABLE, essential for establishing the structure of databases. It then transitions into Data Manipulation Language (DML) commands, exploring INSERT, SELECT, UPDATE, and DELETE for managing data within those structures, while also addressing SQL standards and basic data types.
Sections
Navigate through the learning materials and practice exercises.
What we have learnt
- SQL is the standard language for interacting with relational databases.
- Data Definition Language (DDL) commands define the structure of the database, while Data Manipulation Language (DML) commands manage the data stored within.
- Constraints are vital for ensuring data integrity and consistency in database tables.
Key Concepts
- -- SQL
- Structured Query Language, used to communicate with and manage data in relational databases.
- -- DDL
- Data Definition Language, used to define and modify the structure of database tables.
- -- DML
- Data Manipulation Language, used for managing and manipulating the actual data stored within database tables.
- -- Constraints
- Rules enforced on data columns or tables to maintain integrity and prevent invalid data.
- -- CREATE TABLE
- A SQL command used to create a new table in the database.
- -- INSERT
- A SQL command used to add new rows of data into an existing table.
- -- SELECT
- A SQL command used to retrieve data from one or more tables.
- -- UPDATE
- A SQL command used to modify existing data in a table.
- -- DELETE
- A SQL command used to remove existing rows from a table.
Additional Learning Materials
Supplementary resources to enhance your learning experience.