条件表达式MS Access SQL查询中的数据类型不匹配

Question

当我运行下面的查询时，出现错误“数据类型不匹配”

SELECT o.name as Name,
Month(CDate(type.Value)) as ValueType
FROM (t_obj as o
       INNER JOIN t_prop as type 
         ON o.Obj_ID = type.Obj_ID)
WHERE type.Property LIKE 'Tech*' 
  AND Month(type.Value) = 5

但是，如果我按以下方式运行查询，则效果很好

SELECT o.name as Name,
Month(CDate(type.Value)) as ValueType
FROM (t_obj as o
       INNER JOIN t_prop as type 
         ON o.Obj_ID = type.Obj_ID)
WHERE type.Property LIKE 'Tech*' 

Answer 1

AND Month(type.Value) = 5

至

AND Month(CDate(type.Value)) = 5