摘要:
1.连接查询 1)逗号 ,where select * from Info,nation #笛卡尔积 表与表之间链接在from后面,逗号分开 selsct *(info.code,info.name.sex,nation.name,info.birthday) from Info,nation wh 阅读全文
摘要:
1.增加内容 insert into Info values(‘p001’,‘张三’,true,‘n001’,‘1989-2-3’) insert into Info (code,name) values('p002','李四'); 2.删除数据 delete from Info where Cod 阅读全文