1、增加信息INSERT:
语法格式:insert into table_name [( column1, column2, column3, ... , columnn)] values(value1, value2, value3, ... ,valuen);
例:insert into student (sid, name, sex) values(20170815, '张三', '女');//给指定列插入数据,未指定的列将会赋予空值insert into student (sid, name, sex, address, birthday) values(20170815, '李四', '男', '地球', to_data('19920103','YYYYMMDD'));//因给出了指定列,所以其顺序可以随意排列
insert into student values(20170815, '李四', '男', '地球', to_data('19920103','YYYYMMDD'));//values中的值必须按照创建表时的字段顺序排列
2、查询信息SELECT:
语法格式:select * | column[,.....] from table_name ;
例:select * from student;3、修改信息UPDATE:
语法格式:update table_name set column = value [, column = value,...] [where condition];
例:update student set tel = '15859905695' where sid = 12222222;//更新指定行的tel列 update student set address = '火星';//将表中的address列更新
4、删除信息DELETE:
语法格式:delete from table_name [where condition];
例:delete from student;//删除student表中的所有数据delete from student where sid =12;//删除sid=12的记录