May 2020
Beginner
564 pages
14h 9m
English
Content preview from Learn SQL Database Programming
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Using transactions to save or revert changes
A SQL transaction is a grouping of one or more changes to the database. Transactions help ensure a consistent state in your database. The common terms in SQL transactions are COMMIT and ROLLLBACK. Commit makes the changes permanent and rollback cancels the changes.
There are four properties of transactions to keep in mind:
- Atomicity: This ensures all changes in a transaction are completed successfully. If they are successful, the changes are committed. If any change isn't successful, all the changes are rolled back.
- Consistency: This ensures any changes can't violate the database's integrity, including constraints. Changes interrupted by errors due to violations of database integrity are rolled ...
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