text: -- df English: word=/Users/mertnuhoglu/projects/test_data/google-10000-english-no-swears.txt
  -- df first: word=/Users/mertnuhoglu/projects/test_data/first_names.txt
  -- df last: word=/Users/mertnuhoglu/projects/test_data/last_names.txt
  CREATE TABLE Book(  --df: mult=2.0
    bid SERIAL PRIMARY KEY,
    title TEXT NOT NULL, 
    -- df: text=English length=4 lenvar=3
    isbn INTEGER NOT NULL 
  );
  CREATE TABLE Reader( 
    rid SERIAL PRIMARY KEY,
    firstname TEXT NOT NULL, 
    -- df: text=first length=1 lenvar=0
    lastname TEXT NOT NULL, 
    -- df: text=last length=1 lenvar=0
    born DATE NOT NULL, -- df: start=1950-01-01 end=2005-01-01
    gender BOOLEAN NOT NULL, 
    -- df: rate=0.25
    phone TEXT 
    -- df: chars='0-9' length=10 lenvar=0
    -- df: null=0.01 size=1000000
  );
  CREATE TABLE Borrow( --df: mult=1.5
    borrowed TIMESTAMP NOT NULL, 
    -- df: size=72000 prec=60
    rid INTEGER NOT NULL REFERENCES Reader,
    bid INTEGER NOT NULL REFERENCES Book, 
    note TEXT,
    -- df: sub=power prefix=note size=1000 rate=0.03
    PRIMARY KEY(bid) -- a book is borrowed once at a time!
  );
  
  
  
  