Question

我正在尝试更新表中的注释以存档某些文件。我已经生成了SQL脚本并且因为笔记中有Null值的帐户而出现问题。我希望我的笔记更新在当前笔记字段中是否有Note或Null。下面是我的SQL语句：

update dbo.CaseTable 
set Quick = 'Case files have been archived. To have file access restored,  please enter a helpdesk ticket with the full case name.  '  
            + convert(varchar(255),Quick) 
where CaseID = 1

Answer 1

试试这个：

update dbo.CaseTable 
set Quick = 'Case files have been archived. To have file access restored, please enter a helpdesk ticket with the full case name. '
+ convert(varchar(255), ISNULL(Quick, '')) 
where CaseID = 1

Answer 2

您可以使用 CONCAT 功能。空值隐式转换为空字符串。

试试这个：

  update dbo.CaseTable 
  set Quick = CONCAT('Case files have been archived. To have file access restored, please enter a helpdesk ticket with the full case name. ' , CAST(Quick AS varchar(255)))
  where CaseID = 1

Answer 3

更新dbo.Case表设置quick ='案例文件已存档。要恢复文件访问权限，请输入带有全名的服务台票。' +转换（VARCHAR（255），ISNULL（快速“）） caseID = 1

的地方

考虑Null值的SQL Update

3 个答案: