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byfree 发表于 2008-04-29 17:36:45
待优化SQL:select t2.emperor,t1.* from t1,t2 where t1.countryid=t2.id and t1.CountryId=1010 and t1.DistrictId=1 and playerId<>100
T1表上的索引:SQL> select index_name,column_name from user_...