Auto generate number

[capriconuser]

in this script i want ID which is auto -generate how i do this ?

INPUTFIELD Amount1,Amount2;

Dataa:

LOAD * INLINE [

   Name1, Sales1, Group1

    aname, 24, x

    dname, 26, x

    gname, 57, x

];

Left Join (Dataa)

Load *,

Sales1 As Amount1,

'' As Amount2

Resident Dataa;

[rwunderlich]

RecNo() as Id