Remove a Customer Record Safely Within a Transaction

Transaction for Deleting a Record Safely

Write a PostgreSQL query to delete a customer record within a transaction and commit the change.

Solution:

-- Begin the transaction.
BEGIN;

-- Delete a customer record from the Customers table.
DELETE FROM Customers
WHERE customer_id = 15;

-- Commit the transaction to finalize the deletion.
COMMIT;

Explanation:

• Purpose of the Query:
• To safely remove a record from the database within a controlled transaction.
• Ensures that the deletion is isolated and can be rolled back if necessary.
• Key Components:
• DELETE FROM Customers ... : Removes the specified record.
• BEGIN and COMMIT : Enclose the deletion in a transaction.
• Real-World Application:
• Important for operations where accidental deletions must be prevented by using transactional controls.

Notes:

• Using transactions for deletions allows for recovery if subsequent issues are detected.

For more Practice: Solve these Related Problems:

• Write a PostgreSQL query to delete a record from the Sessions table within a transaction and commit the change.
• Write a PostgreSQL query to delete a customer record from the Customers table and insert a log into the DeletionLog table, then commit within a transaction.
• Write a PostgreSQL query to delete a product from the Products table and update related order records within a transaction.
• Write a PostgreSQL query to delete a user from the Users table and update an audit trail table, all within a transaction.

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Previous PostgreSQL Exercise: Transaction Using SELECT FOR UPDATE for Row Locking.