MySQL的選擇前行

Question

後，這是示例表：

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 

我選擇一列是數據顯示（例如：一行callValue：VAL3）。但我找不到解決方案：
我需要選擇上一行和下一行。所以，在這個例子中，我需要從行vallValue獲取數據：VAL4和callValue：VAL2，或ID：5和ID：12

它不能與id = id + -1，因爲id沒有完成必須連續刪除行。

Answer 1

試試這個：

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) 

Answer 2

一旦你的ID 8，你應該能夠做一個變化：

select * from mytable 
where id < 8 
order by id desc 
limit 1 

和：

select * from mytable 
where id > 8 
order by id asc 
limit 1 

爲上一個和下一個記錄。

Answer 3

這工作：

select a.id, a.name, a.date, a.callValue 
FROM 
(
    select @r0 := @r0 + 1 as rownum, id, name, date, callValue from TABLE 
    , (SELECT @r0 := 0) r0 
) a, 
(
    select @r1 := @r1 + 1 rownum, id, name, date, callValue from TABLE 
    , (SELECT @r1 := 0) r1 
) b 
where b.callValue = val3 and b.rownum between (a.rownum-1 and a.rownum+1) 

它展開的表格到2個維度，因此您可以在拳頭表中的行比較的任何一組從第二排。

Answer 4

select * 
from callvalue 
where id < maxd 
(
select max(id) as maxd 
from callvalue 
where id = maxd 
)