PostgreSQL 7.4 Documentation
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# 30.3. Closing a Connection

To close a connection, use the following statement:

    EXEC SQL DISCONNECT [connection];

The connection can be specified in the following ways:

- connection-name

- DEFAULT

- CURRENT

- ALL

If no connection name is specified, the current connection is closed.

It is good style that an application always explicitly disconnect from every connection it opened.

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