PHP面试题及答案(七)

一、PHP/MySQL编程 1) 某内容管理系统中，表message有如下字段 id 文章id title 文章标题 content 文章内容 category_id 文章分类id hits 点击量 创建上表，写出MySQL语句 2)同样上述内容管理系统：表comment记录用户回复内容，字段如下 comment_id 回复id id 文章id，关联message表中的id comment_content 回复内容 现通过查询数据库需要得到以下格式的文章标题列表,并按照回复数量排序，回复最高的排在最前面 文章id 文章标题 点击量 回复数量   用一个SQL语句完成上述查询，如果文章没有回复则回复数量显示为0 3) 上述内容管理系统，表category保存分类信息，字段如下 category_id int(4) not null auto_increment; categroy_name varchar(40) not null; 用户输入文章时，通过选择下拉菜单选定文章分类 写出如何实现这个下拉菜单 drop table if exists Comment; drop table if exists category; drop table if exists message; /**/ /* ============================================================== */ /**/ /* Table: Comment                                                */ /**/ /* ============================================================== */ create table Comment (     comment_id                      int unsigned                    not null ,     id                              int unsigned                    not null ,     comment_content                 text ,     primary key (comment_id) ) type = InnoDB; /**/ /* ============================================================== */ /**/ /* Table: category                                               */ /**/ /* ============================================================== */ create table category (     category_id                     int                              not null AUTO_INCREMENT,     category_name                   varchar ( 40 )                     not null ,     primary key (category_id),     key AK_pk_category_id (category_id) ) type = InnoDB; /**/ /* ============================================================== */ /**/ /* Table: message                                                */ /**/ /* ============================================================== */ create table message (     id                              int                              not null ,     title                           varchar ( 120 )                    not null ,     content                         text                             not null ,     category_id                     int unsigned,     hit                             int unsigned,     primary key (id) ) type = InnoDB; select A.id,A.title,A.hits,IFNULL(B.num, 0 ) from message A left join ( select id, count ( * ) as num from comment B group by id) B on A.id = B.id order by B.num desc ;   < html > < head >< title > JS打印 </ title ></ head > < body > < form > < select id = " category " name = " category " > <? php mysql_connect ( " localhost " , " root " , "" ) or die ( " db conn error: " . mysql_error ()); mysql_select_db ( " phpinterview " ) or die ( " db error " . mysql_error ()); $result = mysql_query ( " select category_id,category_name from category " ); while ( $row = mysql_fetch_array ( $result )) {      echo " <option value=' " . $row [ " cateogry_id " ] . " '> " . $row [ " category_name " ] . " </option> " ; } ?> </ select > </ form > </ body >