How to restore the previous SQL window in PL/SQL?

In the PL/SQL window, you cannot directly recover previous SQL statements. Once you input or execute a SQL statement in the PL/SQL window, the previous statement cannot be recovered. However, you can try the following methods to recover previous SQL statements:

1. By using the history command, you can retrieve previously executed commands in the PL/SQL window by pressing the up arrow key (↑). Continuing to press the up arrow key allows you to retrieve even earlier commands, helping you find previously entered or executed SQL statements.
2. Using a text editor: If you have previously saved the SQL statement in a text file, you can open the file in the text editor and copy and paste the SQL statement that needs to be restored into the PL/SQL window to execute.
3. Using database logs: If your database has auditing or logging enabled, and previous SQL statements have been recorded in the log file, you can search the log file to find the previously executed SQL statements. The specific steps will depend on the database system and configuration you are using.

Please note that these methods only apply to SQL statements that have already been entered or executed. If you have never entered or executed an SQL statement, you will not be able to recover the previous SQL window.