Question

几天前我的SUBSTRING / CHARINDEX查询中断了，我正在努力了解原因。我正在尝试在“ Appt。Date：”和“ Appt。Time：”之间选择字符（日期），例如：

Status: Future Appointment  Appt. Date:12/14/18  Appt. Time:9:30am
Status: Obtaining Results  Appt. Date:10/05/18  Appt. Time:4:00
Status:   Appt. Date:8/28/2018  Appt. Time: 9:15am

使用此查询：

select ltrim(
            rtrim(
                SUBSTRING([Order Comments], 
                      CHARINDEX('Appt. Date:', [Order Comments]) + LEN('Appt. Date:'), 
                      CHARINDEX('Appt. Time',[Order Comments], CHARINDEX('Appt. Date:', [Order Comments])) - 
                          (CHARINDEX('Appt. Date:', [Order Comments]) + LEN('Appt. Date:'))
                 )
            )
        ) as 'OrderApptDate'
FROM [HIRS_Tools].[dbo].[OMT_BOD]
WHERE [Order Comments] like 'status:%'

SQL错误：

传递给LEFT或SUBSTRING函数的无效长度参数。

我应该采用其他方法来选择日期字符，还是当前查询只是一个问题？任何帮助将不胜感激。

Answer 1

首先，非常感谢大家发布的帖子。即使他们都没有给我确切的答案，他们都给了我一个答案。特别是HABO和3N1GM4！

最终，我发现“申请日期”和“申请时间”字段并不总是完全相同。有Appt的组合。日期：＆Appt。时间，约日期-＆Appt。时间，日期和日期时间...都是从HABO的字段长度表达式中发现的。因此，我添加了一个case语句，以针对每个[Appt Date / Appt Time]组合字段长度进行调整。这解决了所有问题，并给了我足够的杠杆作用，使我的用户可以清理剩余的记录并实现更好的数据输入工作流程。

新查询如下：

select
 case 
  when CHARINDEX('Appt. Time',[Order Comments], CHARINDEX('Appt. Date:', [Order Comments])) - (CHARINDEX('Appt. Date:', [Order Comments]) + LEN('Appt. Date:')) <15
  and [Type]='Procedure' AND [Order Comments] like 'status:%' and [Order Comments] like '%Appt. Time%'
       then ltrim(rtrim(SUBSTRING([Order Comments], CHARINDEX('Appt. Date:', [Order Comments]) + LEN('Appt. Date:'), CHARINDEX('Appt. Time:',[Order Comments], CHARINDEX('Appt. Date:', [Order Comments])) - (CHARINDEX('Appt. Date:', [Order Comments]) + LEN('Appt. Date:')))))
  when CHARINDEX('Appt. Time',[Order Comments], CHARINDEX('Appt. Date:', [Order Comments])) - (CHARINDEX('Appt. Date:', [Order Comments]) + LEN('Appt. Date:')) <15
  and [Type]='Procedure' AND [Order Comments] like 'status:%' and [Order Comments] like '%Appt Time%'
       then ltrim(rtrim(SUBSTRING([Order Comments], CHARINDEX('Appt Date:', [Order Comments]) + LEN('Appt Date:'), CHARINDEX('Appt Time:',[Order Comments], CHARINDEX('Appt Date:', [Order Comments])) - (CHARINDEX('Appt Date:', [Order Comments]) + LEN('Appt Date:')))))
  when (CHARINDEX('Appt. Time',[Order Comments], CHARINDEX('Appt. Date -', [Order Comments])) - (CHARINDEX('Appt. Date -', [Order Comments]) + LEN('Appt. Date -'))) <15
  and [Type]='Procedure' AND [Order Comments] like 'status:%' and [Order Comments] like '%Appt. Date -%'
       then ltrim(rtrim(SUBSTRING([Order Comments], CHARINDEX('Appt. Date -', [Order Comments]) + LEN('Appt. Date -'), CHARINDEX('Appt. Time:',[Order Comments], CHARINDEX('Appt. Date -', [Order Comments])) - (CHARINDEX('Appt. Date -', [Order Comments]) + LEN('Appt. Date -')))))
  when (CHARINDEX('Appt. Time',[Order Comments], CHARINDEX('Appt. Date ', [Order Comments])) - (CHARINDEX('Appt. Date ', [Order Comments]) + LEN('Appt. Date '))) <15
  and [Type]='Procedure' AND [Order Comments] like 'status:%' and [Order Comments] like '%Appt. Date %'
       then ltrim(rtrim(SUBSTRING([Order Comments], CHARINDEX('Appt. Date ', [Order Comments]) + LEN('Appt. Date '), CHARINDEX('Appt. Time:',[Order Comments], CHARINDEX('Appt. Date ', [Order Comments])) - (CHARINDEX('Appt. Date ', [Order Comments]) + LEN('Appt. Date ')))))
       else [Date - Due] end as 'OrderApptDate'

FROM [HIRS_Tools].[dbo].[OMT_BOD]
WHERE ([Order Comments] like 'status:%')

再次感谢您的帮助，希望以后有人对它有用。

SQL在多个字符非常量之间选择字符串

1 个答案: