select Filedata.AutoID,Filedata.Sddate,Filedata.Wh, Filedata.Lwjg,Filedata.Bgqx,Filedata.Caption, ReadDocumentData.DocumentID from Filedata,select DocumentID from ReadDocumentData where UserName='李明生' where Filedata.AutoID=ReadDocumentData.DocumentID
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改改: select Filedata.AutoID,Filedata.Sddate,Filedata.Wh, Filedata.Lwjg,Filedata.Bgqx,Filedata.Caption, ReadDocumentData.DocumentID from Filedata,ReadDocumentData where Filedata.AutoID=ReadDocumentData.DocumentID and ReadDocumentData.UserName='李明生'