sql语句查询excel 2003表，求一sql语句
一个excel表格，4列，6万行左右。
例表：

VB code

A        B        C        D0        1        1        51        2        3        20        7        1        63        2        2        20        6        3        73        1        1        7

要查询A列和C列同时重复的记录，比如上面的第一、第三行……

VB code

  Dim lsSql As String  Dim lrRec As ADODB.Recordset  Dim ldbConn As New ADODB.Connection  ldbConn.ConnectionString = "Provider=MSDASQL.1;Persist Security Info=False;Extended Properties=DSN=Excel Files;DBQ=" & "c:\1.xls; DefaultDir=c:\ ;DriverId=790;MaxBufferSize=2048;PageTimeout=5;"  ldbConn.Open  lsSql = "SELECT * "  lsSql = lsSql & "......."      Set lrRec = New ADODB.Recordset  lrRec.CursorLocation = adUseClient  lrRec.Open lsSql, ldbConn, adOpenForwardOnly, adLockReadOnly

[解决办法]
Excel 可以当作 Jet Enine 的外部数据库来查询。

不过 SQL 语句无法直接支持重复判断的查询。需要多条语句或嵌套语句来实现。例如：

Select * From yourtable Where A*10+C IN (Select x From (Select A*10+C As x, Count(*) As m Group by A*10+C) Where m > 1)