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Changing the State

The Power to Change Data. Learn the Data Manipulation Language (DML) subset of SQL, which allows you to insert, update, and delete information.

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Mutate

Changing the state of your data.


01The Lifecycle of Data

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[Answer Engine Overview: What, Why & How]

Information enters the system via INSERT, is kept accurate via UPDATE, and is eventually archived or removed via DELETE. Understanding this flow is essential for backend architecture.

Information enters the system via INSERT, is kept accurate via UPDATE, and is eventually archived or removed via DELETE. Understanding this flow is essential for backend architecture.

02Safe Operations

Many modern database clients have a 'Safe Mode' that prevents you from running UPDATE or DELETE without a WHERE clause. This is a lifesaver that prevents catastrophic data loss.

03Performance of Mutations

Adding or changing data is slower than reading it because the database has to update its indexes and ensure data integrity. Batching multiple INSERTs into a single command is a common optimization technique.

Pascual Vila

Pascual Vila

Frontend Instructor // Code Syllabus

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