MySQL在行前选择

Question

这是示例表:

Column             | 1st record | 2nd record | 3rd record | 4th record | etc<br />
id (primary)       | 1          | 5          | 8          | 12         | etc<br />
name               | name 1     | name 2     | name 3     | name 4     | etc<br />
date               | date 1     | date 2     | date 3     | date 4     | etc<br />
callValue (unique) | val1       | val2       | val3       | val4       | etc

我选择了一行作为要显示的数据(例如:带有 callValue: val3 的行)。但是我找不到解决方案:
我需要选择上一行和下一行。因此，在本例中，我需要从行 callValue: val4 和 callValue: val2 或 id: 5 和 id: 12 中获取数据。

id=id+-1 无法做到这一点，因为 id 不必因为删除行而连续。

Answer 1

试试这个:

select * from test where callValue = 'val3'  
union all  
(select * from test where callValue < 'val3' order by id desc limit 1) 
union all  
(select * from test where callValue > 'val3' order by id asc limit 1) 

或

select * from test where id = 8
union all  
(select * from test where id < 8 order by id desc limit 1) 
union all  
(select * from test where id > 8 order by id asc limit 1)