访问2007 - 星期

Question

我有一个名为CntDays（date1，date2）的模块。

当我运行此查询，一切工作正常：

SELECT MAX(cont.status) as raStatus, 
     MIN(cont.receipt_time) as startDate, 
     MAX(cont.insp_time_c) AS stopDate, 
     CntDays(DateValue(MIN(cont.receipt_time)),DateValue(MAX(cont.insp_time_c))) AS days, 
     comments.comments AS comments, 
     comments.exempt AS exempt 
FROM cont, comments 
WHERE cont.ra = comments.ra 
GROUP BY cont.ra, comments.comments, comments.exempt 

但是，如果运行此查询：

SELECT DISTINCT cont.ra, 
       MAX(cont.status) as raStatus, 
       MIN(cont.receipt_time) as startDate, 
       MAX(cont.insp_time_c) AS stopDate, 
       CntDays(DateValue(MIN(cont.receipt_time)),DateValue(MAX(cont.insp_time_c))) AS days, 
       comments.comments AS comments, 
       comments.exempt AS exempt 
FROM cont, comments 
WHERE cont.ra = comments.ra 
GROUP BY cont.ra, comments.comments, comments.exempt 

我不断收到此错误信息：

  Data type mismatch in criteria expression. 

的两者之间的区别仅在于“独特的连续”声明。 我不够知识如何解决这个问题。

Answer 1

我删除了DISTINCT，它工作。