create <rname> ( <alist> ) <size>
insert <rname>
delete <rse> ;
update { <attrs> | * } from <rse> ;
print [ using <fname> ] { <attrs> | * } from <rse> [ into <fname> ] ;
select { <attrs> | * } from <rse> [ into <rname> ] ;
import <fname> into <rname>
export <rname> [ into <fname> ] ;
extract <rname> [ into <fname> ] ;
compress <rname>
sort <rname> by <attrs> ;
define <mname>
show <mname>
set [ no ] <option>
help
exit

<alist>		::= <adef> | <alist> <adef>
<adef>		::= <aname> { char | num } <length>
<rse>           ::= <rnames> [ where <boolean> ]
<rnames>        ::= <rname> [ , <rname> ] ...
<rname>         ::= <relation-name> [ <alias> ]
<expr>          ::= <land> [ '|' <land> ]
<land>          ::= <relat> [ '&' <relat> ]
<relat>         ::= <primary> [ <relop> <primary> ]
<primary>       ::= <term> [ <addop> <term> ]
<term>          ::= <unary> [ <mulop> <unary> ]
<unary>         ::= <factor> | <unop> <unary>
<factor>        ::= <operand> | '(' <expr> ')'
<operand>       ::= <number> | <string> | <attribute>
<attribute>     ::= [ <rname> . ] <aname>
<relop>         ::= '=' | '<>' | '<' | '>' | '<=' | '>='
<addop>         ::= '+' | '-'
<mulop>         ::= '*' | '/'
<unop>          ::= '+' | '-' | '~'

'='	equal
'<>'	not equal
'<'	less than
'>'	greater than
'<='	less than or equal
'>='	greater than or equal
'+'	addition or unary plus (not implemented)
'-'	subraction or unary minus (not implemented)
'*'	multiplication (not implemented)
'/'	division (not implemented)
'&'	logical and
'|'	logical or
'~'	logical not

number		a string of digits containing at most one decimal point
string		a string of characters enclosed in double quotes
attribute	an attribute name