Introduction to SQL Concepts
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Questions and Answers

Which category of SQL commands allows you to modify data in a database?

  • DML (Data Manipulation Language) (correct)
  • DDL (Data Definition Language)
  • TCL (Transaction Control Language)
  • DQL (Data Query Language)

What does the COMMIT command do?

  • Permanently saves changes made by DML commands (correct)
  • Retrieves data from a database table
  • Defines a new savepoint in a transaction
  • Rolls back changes to the last committed state

Which command allows you to undo changes made since the last COMMIT or SAVEPOINT?

  • SELECT
  • SAVEPOINT
  • COMMIT
  • ROLLBACK (correct)

What does the SAVEPOINT command do?

<p>Temporarily saves the current state of a transaction (D)</p> Signup and view all the answers

Which SQL statement is used to retrieve data from a database table?

<p>SELECT (A)</p> Signup and view all the answers

If you execute a DML command like UPDATE, and then realize the changes were not required, what command would you use to undo those changes?

<p>ROLLBACK (A)</p> Signup and view all the answers

Which SQL command category allows you to define database structures like tables and indexes?

<p>DDL (Data Definition Language) (B)</p> Signup and view all the answers

What is the purpose of the DCL (Data Control Language) category of SQL commands?

<p>Controlling access to data and resources (C)</p> Signup and view all the answers

Which SQL command category allows you to manage transactions and control the permanence of changes?

<p>TCL (Transaction Control Language) (C)</p> Signup and view all the answers

If you want to jump to a specific savepoint in an ongoing transaction, which command would you use?

<p>Both ROLLBACK and SAVEPOINT (D)</p> Signup and view all the answers

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