As of this writing, YQL doesn't allow you to link tables through common keys (a join), but only permits you to use the results of one query inside another (a subquery).
This site also hosts public records like Building permits, Business licenses, property transfers and similar such services that are essential for the common mass.
这个站点还托管了一些公共报告，比如建筑许可、营业执照、财产转让以及对公众十分重要的诸如此类的服务。
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Next is another agnostic layer that permits a common interface to and from the individual device drivers that are available, followed at the end by the individual device drivers themselves.