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我试图从 MS Access 中构建的两个单独的 sql 查询的结果中获取 AVERAGE。第一个 sql 查询拉取最大的记录：

SELECT DISTINCTROW Sheet1.Tx_Date, Sheet1.LName, Sheet1.Patient_Name, Sheet1.MRN, 
  Max(Sheet1.) AS [Max Of FEV1_ACT], 
  Max(Sheet1.FEF_25_75_ACT) AS [Max Of FEF_25_75_ACT]
FROM Sheet1
GROUP BY Sheet1.Tx_Date, Sheet1.LName, Sheet1.Patient_Name, Sheet1.MRN;

第二条 sql 查询拉取第二大记录：

SELECT Sheet1.MRN, Sheet1.Patient_Name, Sheet1.Lname, 
  Max(Sheet1.FEV1_ACT) AS 2ndLrgOfFEV1_ACT, 
  Max(Sheet1.FEF_25_75_ACT) AS 2ndLrgOfFEF_25_75_ACT
FROM Sheet1
WHERE (((Sheet1.FEV1_ACT)<(SELECT MAX( FEV1_ACT )
                 FROM Sheet1 )))
GROUP BY Sheet1.MRN, Sheet1.Patient_Name, Sheet1.Lname;

这两个查询效果很好，我只需要一些帮助AVERAGE来将这两个查询的结果合二为一。谢谢。

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2 回答 2

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合并这些查询并平均记录集

select avg(select field from table1 union select field from table2)
于 2010-04-27T13:04:06.110 回答
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怎么样

SELECT Avg(FEV1_ACT) FROM
    (SELECT Top 2 FEV1_ACT FROM Sheet1 ORDER BY FEV1_ACT DESC)
于 2010-04-27T13:13:08.820 回答