Updating users data from a different system and presenting this to them

1. When you update a table what is best practice to do prior to updating the data?
2. How do you update a database?
3. Why do we need to update data?

When you update a table what is best practice to do prior to updating the data?

One thing that you should do before performing mass updates or deletes is to run a select statement using conditions provided.

How do you update a database?

The Syntax for SQL UPDATE Command

The UPDATE statement lets the database system know that you wish to update the records for the table specified in the table_name parameter. The columns that you want to modify are listed after the SET statement and are equated to their new updated values. Commas separate these columns.

Why do we need to update data?

Updates can prevent security issues and improve compatibility and program features. Software updates are necessary to keep computers, mobile devices and tablets running smoothly -- and they may lower security vulnerabilities. Data breaches, hacks, cyber attacks and identity theft have all been in the news.