EDIT ──┬────────────┬──>
        ├─> number ──┤
        └─> typebox (*) ───────┘

 Calls EDT, LSE, or VAX TPU, allowing you to edit the interactive
 SQL statements you have issued within a terminal session.  You
 can use the editor in the normal fashion to modify your previous
 interactive SQL statements, construct your next statement or
 group of statements, or include a file with other statements.
 SQL executes the statements in the editing buffer when you exit.

 The number argument to the EDIT statement specifies the number
 of previous command lines you want to edit.  The default is 1.

 The asterisk argument specifies that SQL put the last n command
 lines in the editing buffer, where n is determined by the SET
 EDIT KEEP statement.  The default is 20.

 VAX SQL supports LSE only by allowing you to invoke it with the
 EDIT statement.  VAX SQL does not supply language templates or
 support other features of LSE.