mssqlserver查询方法
其实我做了最简的就是如下写法
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上一条记录的SQL语句： select top 1 * from news where newsid<id order by newsid DESC 下一条记录的SQL语句： select top 1 * from news where newsid>id order by newsid ASC |
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另一种写未能
id是指当前数据news_id参数
方法一：
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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" |
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方法二：
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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 + ")"; |
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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：
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| 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); |
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方法2：
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| 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}); |
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其他更优的暂时还没想出来
时间： 2024-12-10 18:07:27