From the course: SQL Queries Made Easy
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Committing database changes - SQL Tutorial
From the course: SQL Queries Made Easy
Committing database changes
- [Instructor] In this chapter, we will learn about Transaction Control Language, also called TCL. There are three TCL statements namely COMMIT, ROLLBACK, and SAVEPOINT. A transaction begins when the first DML statement is executed, and it ends in three different scenarios. When COMMIT or ROLLBACK is issued, or when a DDL or DCL statement is executed, autocommit will occur. And the third scenario is if the user exits the system or the system crashes. Now let's learn about the first TCL statement that is COMMIT. COMMIT ends the current transaction and saves all the data changes that have been made thus making them permanent. For DML statements, we need to give the COMMIT statement explicitly in order to save the changes, unlike DDL and DCL statements which are autocommited. Autocommit also occurs when the user exits the system normally without explicitly giving a COMMIT statement. Now let's compare the state of…
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