SQL Constraints Explained! #shorts #sql

This SQL tutorial for beginners in english will walk you through what SQL constraints are and how to use them.
To put it simply, SQL constraints specify the rules for your data.
SQL constraints are a set of rules that are applied on the data in your SQL database to control the data that can be stored in a specific column in your database.

SQL constraints limit the types of data that can be provided to a table to ensure reliability and accuracy of data.
There are 7 constraints you can choose from:

1) NOT NULL: Prevents NULL values from being inserted into a SQL column.
2) PRIMARY KEY: Uniquely identifies a row in a database.
3) UNIQUE: Values in a column must be unique (no duplicates.)
4) FOREIGN KEY: References a row in another table.
5) CHECK: Validates a condition.
6) DEFAULT: Defines a default value in a column.
7) CREATE INDEX: Creates a SQL index on a column.

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