sql语句 create database glgl; use glgl; create database glgl; create table user( logname char(20) not null, password char(20), primary key (logname) ); create table history( uniquekey char(30) not null, url char(50), title char(20), leibie char(20), imageurl char(100), time char(20), account char(20), primary key (uniquekey) ); create table shouye( uniquekey char(30) not null, url char(50), title char(20), leibie char(20), imageurl char(100), primary key (uniquekey) );