You've learned INSERT, UPDATE, DELETE, and transactions separately. Now let's combine them for safe practice!
Transactions create a practice environment where you can make mistakes, learn from them, and try again without permanent damage.
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What's the first command you'd use to create this safe practice space?
Here's your safe practice workflow: BEGIN a transaction, make your changes, then either COMMIT (if everything looks good) or ROLLBACK (if something went wrong).
Think of it like having a save point in a video game—you can always go back!
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What is one scenario where you'd definitely want to ROLLBACK instead of COMMIT?
Let's practice with a common mistake. Imagine you want to give all engineers a raise, but accidentally write:
Without WHERE, everyone becomes an engineer with the same salary!
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What's missing from this UPDATE that would make it safer?
Since you're in a transaction, you can check your work before committing. Run SELECT * FROM employees; to see what you actually changed.
If it looks wrong, ROLLBACK returns everything to the state before BEGIN.
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Why is checking your work before COMMIT such a crucial habit?
After ROLLBACK, you're back to the original state. Now you can try again with the correct WHERE clause:
Practice makes perfect when you can safely undo mistakes!
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How does this safety net change your confidence in trying new SQL commands?
