如何理解本地生源优先

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select * from tbl_Articles WHERE ArticleID=214892 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=214892 LIMIT 0,1
select * from tbl_Articles_sphinx where id=214892 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(266967,1744697,1361613,188749,1614030,344671,1130874,2673893,510130,197953,293199,842314,1446304,1588367,419526,1441924,141205,1464041,309879,255971,309949,1708054,346856,1427514,219725,1611980,845295,1063595,1481703,181962) ORDER BY field (ArticleID,266967,1744697,1361613,188749,1614030,344671,1130874,2673893,510130,197953,293199,842314,1446304,1588367,419526,1441924,141205,1464041,309879,255971,309949,1708054,346856,1427514,219725,1611980,845295,1063595,1481703,181962)