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Showing content from http://www.postgresql.org/docs/devel/static/sql-commit.html below:

PostgreSQL: Documentation: devel: COMMIT

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COMMIT — commit the current transaction

COMMIT [ WORK | TRANSACTION ] [ AND [ NO ] CHAIN ]

COMMIT commits the current transaction. All changes made by the transaction become visible to others and are guaranteed to be durable if a crash occurs.

WORK
TRANSACTION #

Optional key words. They have no effect.

AND CHAIN #

If AND CHAIN is specified, a new transaction is immediately started with the same transaction characteristics (see SET TRANSACTION) as the just finished one. Otherwise, no new transaction is started.

Use ROLLBACK to abort a transaction.

Issuing COMMIT when not inside a transaction does no harm, but it will provoke a warning message. COMMIT AND CHAIN when not inside a transaction is an error.

To commit the current transaction and make all changes permanent:

COMMIT;

The command COMMIT conforms to the SQL standard. The form COMMIT TRANSACTION is a PostgreSQL extension.

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