获取大于和小于主ID的记录

Question

我有铅表，其中lead_id是主要ID，我想在单个查询中获取下一个lead_id和前一个lead_id .Lead_id是自动递增但是lead_id与用户有关系。是否可以在单个查询中获取数据？

Answer 1

可能你可以尝试类似的东西

(select lead_id from lead where lead_id < 4 order by lead_id DESC limit 1)    
union 
(select lead_id from lead where lead_id > 4 order by lead_id ASC limit 1)

Answer 2

试试这个

select * from lead where 
      lead_id = (select min(lead_id) from lead where lead_id > 4) AND 
      lead_id = (select max(lead_id) from lead where lead_id < 4)

Answer 3

Haven没有测试过这段代码，但是应该是类似下面的内容，其中$ lead_id是你带有一个名为lead的表的php lead_id

$query="SELECT * FROM lead WHERE lead_id =($lead_id+1) OR lead_id=($lead_id -1)";