Question

我有一个具有以下结构的SQL Server表

cod_turn (PrimaryKey)
taken    (bit)
time     (datetime)

和其他几个与问题无关的字段。我无法改变表格结构，因为该应用程序是由其他人制作的。

给出一个数值变量参数，我们假设这个例子为“3”，一个时间，我需要创建一个从那个时间开始查看的查询，它看起来没有标记的前3个连续记录作为“采取”。如果可能的话，我无法弄清楚如何在纯sql中进行查询。

PS：我接受了答案，因为它是正确的，但我对问题做了很糟糕的描述。我稍后会再提一个问题。看到答案的大小后感到愚蠢=）

Answer 1

SELECT TOP 3 * FROM table WHERE taken = 0 AND time>=@Time ORDER BY time

@Time是你传入的时间。

Answer 2

假设当前版本的SQL Server并假设您已将“数字变量参数”命名为@top int。注意：使用参数化TOP时，@top 周围的括号

SELECT TOP (@top) 
   cod_turn,
   taken ,
   time
FROM yourtable 
 WHERE Taken = 0 AND time>=@Time 
ORDER BY time     DESC

您也可以

with cte as 
(
    SELECT 
       ROW_NUMBER() over (order by time desc) rn
       cod_turn,
       taken ,
       time
    FROM yourtable 
     WHERE Taken = 0 AND time>=@Time 
)
SELECT 
cod_turn,
       taken ,
       time
FROM CTE
WHERE rn <= @top
    ORDER BY time     DESC

Answer 3

SELECT TOP 3 
* 
FROM 
   table 
WHERE 
   time >= @inserted_time 
   AND taken = 0 
ORDER BY 
   cod_turn ASC

Answer 4

select MT.*
from 
(
    select cod_turn, ROW_NUMBER() OVER (ORDER BY cod_turn) [RowNumber] -- or by time
    from myTable
    where taken = 0
    and time >= @myTime
) T
inner join myTable MT on MT.cod_turn = T.cod_turn
where T.RowNumber < @myNumber

Answer 5

select top 3 * from theTable where taken = 0 and time > theTime orderby time

如何编写这个sql查询

5 个答案: