條件表達式MS Access SQL查詢中的數據類型不匹配

Question

當我運行下面的查詢時，出現錯誤“數據類型不匹配”

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，如果我按以下方式運行查詢，則效果很好

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