create <rname> ( <adefs> ) <size>       - create a new relation

insert <rname>                          - insert tuples into a relation

delete <rse> ;                          - delete tuples from relations

update <anames> from <rse> ;            - update tuples within a relation

print [<u>] <anames> from <rse> [<i>] ; - print tuples

sort <rname> by <snames> ;              - sort a relation file

import <fname> into <rname>             - import tuples from a file

export <rname> [<i>] ;                  - export tuples to a file

extract <rname> [<i>] ;                 - extract definition to a file

compress <rname>                        - compress a relation file

define <mname>                          - define a macro

exit                                    - exit SDB



<u>             ::=     using <fname>

<i>             ::=     into <fname>

<adefs>         ::=     <a list of attribute definitions>

<rse>           ::=     <rnames> [where <boolean-expression>]

<rname>         ::=     <a relation name>

<rnames>        ::=     <a comma separated list of <rname>s>

<aname>         ::=     [<rname> .] <an attribute name>

<anames>        ::=     * | <a comma separated list of <aname>s>

<sname>         ::=     <aname> { ascending | descending }

<snames>        ::=     <a comma separated list of <sname>s>

