Sql Programming Tutorials, Guides & Best Practices

START TRANSACTION;

INSERT INTO accounts (user_id, balance) VALUES (1, 100);

UPDATE accounts SET balance = balance - 50 WHERE user_id = 1;

COMMIT;

In this example, two operations are performed within a transaction: inserting a new account and updating the balance. If any operation fails, you can use ROLLBACK to undo the changes.

This query will output the size of the specified database in megabytes (MB).

To identify the largest table in terms of size within a specific database, use a similar query but without the grouping. Instead, order by size and limit the result to find the largest table: