Question

我的数据库中有4个表（2014,2013,2012,2011），每个表都有相同的列CODE。我想创建一个这样的新表：

，其中代码是：所有四个表中的所有唯一代码和 2014年：此表中的代码为6602658的次数是多少次？

感谢您的任何建议： - ）

Answer 1

创建一个新查询并将其作为SQL：

 SELECT DISTINCT 2014 As Year, tblCombined.Code 
 INTO tblNEWTABLE 
 FROM (SELECT Code FROM tbl2014 
       UNION ALL 
       SELECT Code FROM tbl2013 
       UNION ALL 
       SELECT Code FROM tbl2012 
       UNION ALL 
       SELECT Code FROM tbl2011) As tblCombined

其中＆＃34; Code＆＃34;是该字段的名称和＆＃34; tbl2014＆＃34;等等是表格的名称。

您可能正在寻找：

 SELECT tblCombined.Code, Sum(tblCombined.C2014) As Count2014
        , Sum(tblCombined.C2013) As Count2013
        , Sum(tblCombined.C2012) As Count2012
        , Sum(tblCombined.C2011) As Count2011
 INTO tblNEWTABLE 
 FROM (SELECT Code, Count(Code) As C2014, 0 As C2013, 0 As C2012, 0 As C2011
       FROM tbl2014 GROUP BY Code
       UNION ALL 
       SELECT Code, 0 As C2014, Count(Code) As C2013, 0 As C2012, 0 As C2011
       FROM tbl2013 GROUP BY Code           
       UNION ALL 
       SELECT Code, 0 As C2014, 0 As C2013, Count(Code) As C2012, 0 As C2011
       FROM tbl2012 GROUP BY Code
       UNION ALL 
       SELECT Code, 0 As C2014, 0 As C2013, 0 As C2012, Count(Code) As C2011
       FROM tbl2011 GROUP BY Code
      ) As tblCombined 
GROUP BY tblCombined.Code

这应该为您提供每年每个代码的记录数。这可能不是最有效的方法，但它应该有效。

您还可以使用＆＃34; CROSSTAB＆＃34;查询，但这个解决方案也可以。

MS Access表分析

1 个答案: