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1、通过物化视图的方式优化数据查询速度:
create materialized view MV_DT_DJXH
refresh force on demand
enable query rewrite
as
select b.djxh, b.nsrsbh ,a.cwfzrsfzjhm ,a.bsrsfzjhm
from dj_nsrxx_kz a, dj_nsrxx b
where a.djxh = b.djxh and b.nsrzt_dm = '03';