1 create table t1(t1key INTEGER PRIMARY KEY, data TEXT, num double, timeEnter DATE); 

     2 create table t2(t1key INTEGER PRIMARY KEY, data TEXT, num double, timeEnter DATE); 

     3 create table t3(t1key INTEGER PRIMARY KEY, data TEXT, num double, timeEnter DATE); 

     4 create table t4(t1key INTEGER PRIMARY KEY, data TEXT, num double, timeEnter DATE);