MS Access - 查询表达式中的语法错误（缺少运算符）

Question

SELECT * FROM exclusivity
left join patent on (exclusivity.[Appl_Type]=patent.[Appl_Type] AND exclusivity.[Appl_No]=patent.[Appl_No] AND exclusivity.[Product_No]=patent.[Product_No])
left join products on (exclusivity.[Appl_Type]=products.[Appl_Type] AND exclusivity.[Appl_No]=products.[Appl_No] AND exclusivity.[Product_No]=products.[Product_No]);

上面的查询给出了语法错误

（缺少运算符）在查询表达式 'exclusivity.[Appl_Type]=patent.[Appl_Type] AND exclusivity.[Appl_No]=patent.[Appl_No] AND exclusivity.[Product_No]=patent.[Product_No]) 上留下连接产品 (exclusivity) .[Appl_Type]=products.[Appl_Type] AND 独占性。[Appl_No]=products.[Appl_No] AND 独占性。[Product_No]=products.[Product_No]);'

可能的原因是什么？

Answer 1

MS Access 对连接周围的括号有奇怪的要求：

SELECT *
FROM (exclusivity left join
      patent
      on exclusivity.[Appl_Type] = patent.[Appl_Type] AND
         exclusivity.[Appl_No] = patent.[Appl_No] AND
         exclusivity.[Product_No] = patent.[Product_No]
    ) left join
    products
    on exclusivity.[Appl_Type] = products.[Appl_Type] AND
       exclusivity.[Appl_No] = products.[Appl_No] AND
       exclusivity.[Product_No] = products.[Product_No];