最近学习的sql查询语句连接查询，标记一下

 select wordbase.name,wb.name,wordconnection.wordid,wordconnection.aid,wordbase.goodsid,goods.hscode,goods.name from wordbase join wordconnection on wordbase.id=wordconnection.wordid ,wordbase wb,goods

 where wordbase.name='THREAD' and wb.id=wordconnection.aid and wb.name='STEEL' and wordbase.goodsid=wb.goodsid and wordbase.goodsid=goods.id

 select * from wordbase

标记一下，回头删除。