代码
Select PrimaryKey=a.name FROM syscolumns a join sysobjects b on a.id=b.id and b.xtype='U' and b.name<>'dtproperties' where exists(SELECT 1 FROM sysobjects where xtype='PK' and name in(SELECT name FROM sysindexes WHERE indid in(SELECT indid FROM sysindexkeys WHERE id=a.id AND colid=a.colid))) and b.name='表名'