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  1. create <rname> ( <adefs> ) <size>       - create a new relation
  2. insert <rname>                          - insert tuples into a relation
  3. delete <rse> ;                          - delete tuples from relations
  4. update <anames> from <rse> ;            - update tuples within a relation
  5. print [<u>] <anames> from <rse> [<i>] ; - print tuples
  6. sort <rname> by <snames> ;              - sort a relation file
  7. import <fname> into <rname>             - import tuples from a file
  8. export <rname> [<i>] ;                  - export tuples to a file
  9. extract <rname> [<i>] ;                 - extract definition to a file
  10. compress <rname>                        - compress a relation file
  11. define <mname>                          - define a macro
  12. exit                                    - exit SDB
  13.  
  14. <u>             ::=     using <fname>
  15. <i>             ::=     into <fname>
  16. <adefs>         ::=     <a list of attribute definitions>
  17. <rse>           ::=     <rnames> [where <boolean-expression>]
  18. <rname>         ::=     <a relation name>
  19. <rnames>        ::=     <a comma separated list of <rname>s>
  20. <aname>         ::=     [<rname> .] <an attribute name>
  21. <anames>        ::=     * | <a comma separated list of <aname>s>
  22. <sname>         ::=     <aname> { ascending | descending }
  23. <snames>        ::=     <a comma separated list of <sname>s>
  24. uδ3▒ïF╙αï^ â├(╪╕
  25. PS vΦ?,ïσà└u╕PΦ░Nïσâ─]├ Fδ»â~u╕