SQL statement history is designed to ease recalling and re-executing statements you have previously executed. Choose View SQL history from the SQL menu to bring up a dialog where you can choose which SQL statement must be inserted into the editor instead of current one. Point with the mouse on a statement in a history to view its full text in a hint.
For quick navigation through executed statements you may use the Previous SQL and Next SQL buttons. Previous SQL goes down the stack and Next SQL goes up.
Note: The history clears when application is closed or SQL document is saved or opened, so you have to save your queries for long-term use. SQL history is not available when working with an opened file.