Master PostgreSQL Transactions with BEGIN, COMMIT, and ROLLBACK
This resource offers a total of 60 PostgreSQL BEGIN, COMMIT, ROLLBACK problems for practice. It includes 12 main exercises, each accompanied by solutions, detailed explanations, and four related problems.
Following exercises demonstrate how to use transactions with BEGIN, COMMIT, and ROLLBACK to maintain data integrity and control concurrency in PostgreSQL.
1. Basic Transaction with BEGIN and COMMIT
Write a PostgreSQL query to update an employee's salary within a transaction using BEGIN and COMMIT.
2. Transaction with ROLLBACK on Error
Write a PostgreSQL query to update multiple records within a transaction and then rollback if an error is detected.
3. Multi-Operation Transaction with COMMIT
Write a PostgreSQL query to perform multiple DML operations (INSERT, UPDATE, DELETE) within a single transaction.
4. Transaction for Fund Transfer between Accounts
Write a PostgreSQL query to transfer funds between two accounts using a transaction.
5. Transaction to Insert and Update Related Records
Write a PostgreSQL query to insert a new order and update the corresponding customer's last order date within a transaction.
6. Transaction for Bulk Update with Rollback
Write a PostgreSQL query to perform a bulk update on product prices and rollback if an error is encountered.
7. Transaction Using SELECT FOR UPDATE for Row Locking
Write a PostgreSQL query to lock a row for update within a transaction using SELECT FOR UPDATE.
8. Transaction for Deleting a Record Safely
Write a PostgreSQL query to delete a customer record within a transaction and commit the change.
9. Transaction with Conditional Check (Simulated Error Scenario)
Write a PostgreSQL query to perform an update within a transaction and rollback if a certain condition is not met (simulated with a manual ROLLBACK).
10. Transaction for Inserting a New Order and Updating Inventory
Write a PostgreSQL query to insert a new order and update the product inventory in a single transaction.
11. Transaction to Update and Delete in One Operation
Write a PostgreSQL query to update a record and delete a related record within a single transaction.
12. Transaction for Maintaining Data Consistency Across Multiple Tables
Write a PostgreSQL query to update multiple related tables within a transaction to ensure data consistency.
More to Come !
Do not submit any solution of the above exercises at here, if you want to contribute go to the appropriate exercise page.
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