Question

我在存储过程中有以下代码段：

where
((Question = 'SurgicalSectionCompleted' and ChangeTo = 'True') or
(Question = 'MedicalSectionCompleted' and ChangeTo = 'True'))

但是，有时在相关表格中，会有多个条目，其中ChangeTo将为true。至关重要的是，我只根据ChangeTo为True的FIRST记录进行计算。我可以使用哪些SQL命令来执行此操作？有任何想法吗？感谢。

表中记录的字段是：id，name，personNo，entryTime，question，changeFrom，ChangeTo

Answer 1

如果只想返回一行，请使用TOP 1。首先，使用ORDER BY：

select top 1 t.*
from t
where Question in ('SurgicalSectionCompleted', 'MedicalSectionCompleted') and 
      ChangeTo = 'True'
order by entryTime asc;

如果您想要每个人的第一个，请使用row_number()：

select t.*
from (select t.*,
             row_number() over (partition by personNo order by entryTime) as seqnum
      from t
      where Question in ('SurgicalSectionCompleted', 'MedicalSectionCompleted') and 
            ChangeTo = 'True'
     ) t
where seqnum = 1;

Answer 2

使用TOP 1

select TOP 1 *
from table1
where
((Question = 'SurgicalSectionCompleted' and ChangeTo = 'True') or
(Question = 'MedicalSectionCompleted' and ChangeTo = 'True'))
order by <col1>

SQL - 仅限第一条记录

2 个答案: