You can define a symbol to help you invoke the SQL precompiler:

    $ SQLPRE == "$SQL$PRE"

    Because the SQL precompiler requires a language qualifier, you
    might want to define a particular language so that you can invoke
    the command on one line:

    $ SADA == "$SQL$PRE/ADA"
    $ SADA SQL_DYNAMIC

    By defining symbols, you can invoke the SQL precompiler with or
    without a file specification for a host language program file:

    o  If you invoke the SQL precompiler without an input file
       specification for a host language program file, the
       precompiler prompts you for it. For example:

       $ SQLPRE
       INPUT FILE> pre-host-file-spec

    o  If you invoke the SQL precompiler with a host language program
       file as part of the DCL command line, SQL starts processing
       your file immediately after you press the Return key. For
       example:

       $ SADA pre-host-file-spec pre-qualifiers

    Whichever method you choose to invoke the precompiler, you have
    the option to specify a wide range of qualifiers that control
    how the SQL precompiler processes the module file. The syntax
    diagrams show the format for the qualifiers that you can include
    with the host language program file specification.