Question

我有一系列5个变量（来自同一张表）。我想查询一个查询，向我显示中至少有一个这些变量值的参与者。即，如果所有5个变量都是空白，则不显示该参与者。我怎么能这样做呢？

SELECT [Patient Information].MRN, [Patient Information].[MRI_Results(1)], [Patient Information].[MRI_Results(2)], [Patient Information].[Blood_Results(Base)], [Patient Information].[Blood_Results(FU1)], [Patient Information].[Blood_Results(FU2)], [Patient Information].[Blood_Results(FU3)]
FROM [Patient Information]
ORDER BY [Patient Information].[MRI_Results(1)] DESC , [Patient Information].[MRI_Results(2)] DESC , [Patient Information].[Blood_Results(Base)] DESC , [Patient Information].[Blood_Results(FU1)] DESC , [Patient Information].[Blood_Results(FU2)] DESC , [Patient Information].[Blood_Results(FU3)] DESC;

Answer 1

一个简单的“WHERE”子句可以解决问题。您希望使用OR运算符，因为只要有一个值，您希望保留记录。

根据您的值，您可能需要更改语法（即“Not IsNull（）”而不是“Is Not Null”），因此这可能需要进行一些小的调整，但应该让您朝着正确的方向前进。

SELECT [Patient Information].MRN, [Patient Information].[MRI_Results(1)],
       [Patient Information].[MRI_Results(2)], 
       [Patient Information].[Blood_Results(Base)], 
       [Patient Information].[Blood_Results(FU1)], 
       [Patient Information].[Blood_Results(FU2)], 
       [Patient Information].[Blood_Results(FU3)]
FROM [Patient Information]
WHERE [Patient Information].MRN IS NOT NULL
  OR [Patient Information].[MRI_Results(1)] IS NOT NULL
  OR [Patient Information].[MRI_Results(2)] IS NOT NULL
  OR [Patient Information].[Blood_Results(Base)] IS NOT NULL
  OR [Patient Information].[Blood_Results(FU1)] IS NOT NULL
  OR [Patient Information].[Blood_Results(FU2)] IS NOT NULL
  OR [Patient Information].[Blood_Results(FU3)] IS NOT NULL

ORDER BY [Patient Information].[MRI_Results(1)] DESC , 
         [Patient Information].[MRI_Results(2)] DESC , 
         [Patient Information].[Blood_Results(Base)] DESC , 
         [Patient Information].[Blood_Results(FU1)] DESC , 
         [Patient Information].[Blood_Results(FU2)] DESC , 
         [Patient Information].[Blood_Results(FU3)] DESC;

跨多个变量Access Query显示结果

1 个答案: