Drill 16: Teach it — Changing data safely
Explain the example to someone who has never seen it.
What you will be able to do
- Explain the example to someone who has never seen it.
Practice task
Explain the example to someone who has never seen it.
BEGIN;
INSERT INTO lessons (id, course_slug, title, minutes, level)
VALUES (11, 'sql', 'Transactions', 16, 'Advanced');
UPDATE lessons
SET minutes = minutes + 2
WHERE course_slug = 'sql';
SELECT id, title, minutes
FROM lessons
WHERE course_slug = 'sql';
ROLLBACK;Your turn
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Explain the example to someone who has never seen it.
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