SQL查询当前数据上一条和下一条的记录

SQL查询当前数据上一条和下一条的记录,第1张

获取当前文件上一条与下一条记录的原理是上一条的sql语句,从news表里按从大到小的顺序选择一条比当前ID小的新闻,下一条的sql语句,从news表里按从小到大的顺序选择一条比当前ID大的新闻。

mssqlserver查询方法

其实我做了最简的就是如下写法

代码如下 复制代码

上一条记录的SQL语句:

top 1 * from news where newsid

下一条记录的SQL语句:

select top 1 * from news where newsid>id order by newsid ASC


另一种写未能

id是指当前数据news_id参数


方法一:

代码如下 复制代码


string preSql = "select top 1 * from news where news_id < " id " order by news_id DESC"

string nextSql = "select top 1 * from news where news_id > " id " order by news_id ASC"


方法二:

代码如下 复制代码


string preSql = "select * from [news] where news_id = (select MAX(news_id) from [news] where news_id<" id ")";
string nextSql = "select * from [news] where news_id = (select MIN(news_id) from [news] where news_id>" id ")";

mysql查询上一条与下一条的办法

如果ID是主键或者有索引,可以直接查找:
方法1:

代码如下 复制代码
1.select * from table_a where id = (select id from table_a where id < {$id} order by id desc limit 1);
2.select * from table_a where id = (select id from table_a where id > {$id} order by id asc limit 1);

方法2:

代码如下 复制代码
1.select * from table_a where id = (select max(id) from table_a where id < {$id});
2.select * from table_a where id = (select min(id) from table_a where id > {$id});

其他更优的暂时还没想出来

文章来源:https://www.php.cn/faq/149882.html

本文经用户投稿或网站收集转载,如有侵权请联系本站。

发表评论

0条回复