What is a constraint in SQL?

Which of the following statements describe constraints in SQL?

A SQL constraint helps maintain data integrity and consistency. By preventing invalid or inappropriate data from being entered into a table. They ensure that the data follows predefined rules.

There are various types of constraints in SQL such as NOT NULL, UNIQUE, PRIMARY KEY and FOREIGN KEY, each of which serves a specific purpose in data validation. They are like different tools in the data quality toolkit.

Constraints improve the speed of data retrieval by pre-sorting data into specific columns.

Properly designed constraints can help prevent errors and data inconsistencies, resulting in more reliable and valid data in your database. This allows you to catch errors before they happen.

Constraints automatically organize data in a table in a specific order.

An SQL constraint is a rule enforced within a database table that limits the values that can be stored in specific columns.

An SQL constraint is a way to password protect individual columns in a table.

Constraints can be added or removed dynamically as data is manipulated in the query.

Constraints are only necessary for complex database applications; simple databases don't need them.

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What is a constraint in SQL?