update a set a.geom = b.geom from dma_area a inner join dma_area_copy b on a.bs_area_id = b.bs_area_id where a.dmalevel in ('2','3');
参考文章：
https://www.cnblogs.com/yanggb/p/11328481.html
备注：以下子查询的方式会报错：
update dma_area a set a.geom = ( select b.geom from DMA_AREA_copy b where b.bs_area_id = a.bs_area_id ) where a.dmalevel in ('2','3');
