> library(RODBC)
> q=odbcConnectExcel("sj.xls")
> w=sqlFetch(q)
Error in sqlFetch(q) : missing argument 'sqtable'
> mydataframe(q,"sheet1")
Error: could not find function "mydataframe"
> mydataframe=(q,"sheet1")
Error: unexpected ',' in "mydataframe=(q,"
>  mydataframe=sqlFetch(q,"sheet1")
Error in odbcTableExists(channel, sqtable) :
  ‘sheet1’: table not found on channel
>  mydataframe=sqlFetch(q,"Sheet1")
Error in odbcTableExists(channel, sqtable) :
  ‘Sheet1’: table not found on channel
>为什么会出现这种情况，求大神指点。