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删除字段:ALTER TABLE table_name DROP field_name;
mysql_query("update table set name='李四' where id=1");
//增加
mysql_query("insert into table(name,email)values('张三','abc@yahoo.cn')");
//更改
mysql_query("update table set name='李四' where id=1");
//删除
mysql_query("delete from table where name='李四'");