Calls an editor that lets you modify the SQL statements you
    issued within a terminal session.

    SQL supports a variety editors, some of which are:

    o  EDT

    o  DEC Text Processing Utility (DECTPU) editors on OpenVMS, such
       as EVE

    o  Language-Sensitive Editor (LSE) on OpenVMS, which is based
       on DECTPU and provides templates that guide you in entering
       syntactically correct statements

    To invoke an editor other than the default, you must define the
    SQL$EDIT logical name.

    You can use the editor you choose with your usual initialization
    file to modify your previous SQL statements, construct your next
    statement or group of statements, or include a file with other
    statements.