SQL Data Manipulation : UPDATE, ALTER, and DELETE Explained with Key Differences!
SQL Data Manipulation: UPDATE, ALTER, and DELETE Explained with Key Differences!"
Video Caption:
In this video, we dive into essential SQL data manipulation commands: UPDATE, ALTER, and DELETE. These commands are key for maintaining and managing database records, allowing you to modify, delete, or change the structure of your data. Here’s a breakdown of each command and when to use it:
UPDATE Statement – The UPDATE command is used to modify existing records in a table. You can update specific rows based on a condition (using the WHERE clause) or all rows if needed. This is perfect for correcting or modifying data entries without changing the structure of the table.
ALTER Statement – Unlike UPDATE, which changes data within a table, ALTER modifies the structure of the table itself. With ALTER, you can add, delete, or modify columns or even constraints, adapting your table’s design to fit evolving data needs.
DELETE Statement – DELETE is used to remove records from a table, either entirely or conditionally (with the WHERE clause). However, unlike TRUNCATE (which removes all rows), DELETE can be controlled to target specific rows, providing flexibility when cleaning up or managing data.
UPDATE vs. ALTER: Key Differences
UPDATE changes the data within a table but not its structure.
ALTER changes the structure of the table but doesn’t alter or affect the existing data within rows.
In this video, you’ll get a clear understanding of how and when to use each command, with practical examples to illustrate each function’s purpose. Perfect for those wanting to manage and manipulate databases efficiently!
Don’t forget to like, subscribe, and comment with your questions or any topics you’d like us to cover in future videos.
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