SQL Data Types | SQL Constraints | Relational Database and SQL (Part 5) | CBSE Class 12 Comp Sci
SQL Data Types & Constraints | Relational Database and SQL (Part 5)
Welcome to the Part 5 series of the Relational Database and SQL. In this video, we delve into the fundamental concepts of SQL Data Types and Constraints. Understanding these basics is crucial for working effectively with SQL databases.
This session covers:
SQL Data Types:
Overview of different data types used in SQL to define the kind of data that can be stored
in a database.
Detailed explanation of common SQL data types like INTEGER, FLOAT, NUMERIC(p,s),
DECIMAL(p,s), CHAR, VARCHAR, DATE, and TIME.
Difference between CHAR and VARCHAR:
Key differences between fixed-length (CHAR) and variable-length (VARCHAR) character
data types.
Examples of when to use CHAR vs. VARCHAR.
SQL Constraints:
Introduction to constraints and their role in maintaining the integrity of database data.
Explanation of primary SQL constraints: PRIMARY KEY, NOT NULL, UNIQUE, CHECK,
DEFAULT, and FOREIGN KEY.
PRIMARY KEY:
Ensures that each record in a table is unique and not null.
NOT NULL:
Ensures that a column cannot have a NULL value.
UNIQUE:
Ensures all values in a column are distinct.
CHECK:
Validates that values in a column meet specific criteria.
DEFAULT:
Sets a default value for a column when no value is specified.
FOREIGN KEY:
Maintains referential integrity between tables by linking the foreign key in one table to a
primary key in another table.
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