Question

使用Access 2010，我试图按开关值分组，目前在编制代码时遇到麻烦。基本上，在我的数据库的治疗字段中，我有诸如D1，D2，D3，E1，E2，E3之类的值。第一个字母表示特定的处理类型，例如D =处理1，E =处理2。例如，我希望按“ Treatment1”和“ Treatment2”对数据进行分组。

SELECT switch(LEFT(t1.[treatment],1)='D',"Treatment1",LEFT(t1.[treatment],1)='E',"Treatment2"), count(t1.[UniqueID]) AS Total_Population, count(t2.[date]) AS DateSent, format(count(t2.[date]) / count(t1.[UniqueID]),"0.00%") AS Percentage_Sent, COUNT(IIF(t1.[requirements]='1',1,)) AS requirements_population
FROM Main_table AS t1 LEFT JOIN (SELECT t2.[ID], t2.[date] FROM Main_table AS t2 WHERE t2.date Not Like ('NA'))  AS t2 ON t1.[ID] = t2.[ID]
GROUP BY  [treatment]

例如，预期输出为Treatment1-x量，Treatment2-y量。但是目前，我得到了处理1和处理2的多行，因为这些表达式后面的数据不是唯一的（即D1，D2，D3，E1，E2，E3）。

Answer 1

更改为：

class ESBEvent {
    private String msgID;
    private Date timestamp;
    private String applicationName;
    private String routeName;
    private String eventName;
    private String globalTrxID;
    private String parentTrxID;
    private byte[] paylod; 
}

因此，您将GROUP BY LEFT(t1.[treatment], 1)的第一个字母而不是t1.[treatment]分组

Access SQL-是否可以按开关值分组？

1 个答案: