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：

A        B        C        D
0        1        1        5
1        2        3        2
0        7        1        6
3        2        2        2
0        6        3        7
3        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……

  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)