Why is SELECT * actually dangerous in production?

Description:
Why is `SELECT *` considered bad practice in production?

`SELECT *` looks harmless, but as your database tables grow, it can make your application retrieve and process far more data than it actually needs.

In this Short, we break down why experienced backend engineers prefer selecting specific columns, how extra columns can increase data transfer and processing, and how `SELECT *` can sometimes prevent the database from answering a query efficiently using an index.

If you're learning SQL, database optimization, backend development, or system design, this is a small SQL habit worth understanding.

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