Excel工作表上的ExecuteNonQuery时出错

Question

updateCommand.CommandText = "Update E set [LR/Virtual/MW]='LR',[Vir No#]=null from [E1$] E join (SELECT [Conc] , [Vir No#] FROM [E1$] where [Vir No#] is not null group by Conc ,[Vir No#] having  Count(LR)<28) a on e.[Conc]=a.[Conc] and e.[Vir No#]=a.[Vir No#]";

以及何时

updateCommand.ExecuteNonQuery();

我收到错误

  

查询表达式中的语法错误（缺少运算符）'来自[E1 $] E的空值   join（SELECT [Conc]，[Vir No＃] FROM [E1 $]其中[Vir No＃]不为null   在Conc上分组，[Vir No＃]具有计数（LR）＆lt; 28）a e。[Conc] = a。[Conc]   和e。[Vir No＃] = a。[Vir No＃]'。