DDR Data Science Interview Practice Test

What does TCL manage?

Defining database schemas. Querying data with SELECT statements. Managing user permissions. Controlling transactions, such as COMMIT and ROLLBACK.

Correct Answer:

Controlling transactions, such as COMMIT and ROLLBACK.

Explanation:

Transaction control language focuses on managing groups of database operations as a single unit. It lets you start a transaction, perform multiple changes, and then decide whether to apply all of them or undo them. The main commands COMMIT and ROLLBACK are used to finalize changes or revert them if something goes wrong. This control is what preserves atomicity and consistency across operations, ensuring that either everything in the transaction takes effect or none of it does. Some systems also support SAVEPOINT to mark a point to which you can roll back within a transaction. In contrast, defining database schemas, querying data, or setting permissions belong to other SQL sublanguages, while TCL specifically handles transaction flow.

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