INSERT, UPDATE, and DELETE
Learn how to add, update or delete data in sql tables.
Step 1: Start with a big idea
Until now, your SQL queries have been non-destructive; they only read from the database. But every database needs to evolve:
New customers get added.
Prices get updated.
Old data gets cleaned up.
So now we shift from asking to acting. Before writing any query, remember this golden rule: When modifying data, clarity beats speed.
You’ll always verify your query logic before execution, with AI as your safety partner.
Step 2: Adding new data (INSERT)
Let’s start simple. Say you have a table called employees with these columns: | id | first_name | last_name | department | salary | ...