Entire Script
To execute an entire script, click the Execute Large Script button on the toolbar 
Alternatively, select the Execute command on the SQL menu or press F5.

Selected Block of Text
To execute an arbitrary text block:
Select the text block using a mouse or a keyboard.
Click the Execute button on the toolbar 
Current Statement
To execute a current statement, select the Execute Current Statement command from the SQL menu.

To stop SQL execution, click Stop Execution command from the SQL menu.
The query execution results can be represented in two ways: in a text and in a grid formats.
To represent results as a text, click Results as Text on the SQL menu before query execution.
To represent results as a grid, click Results as Grid on the SQL menu before query execution.