在比例里两个外项的积等于两个内项的积这叫做什么

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select * from tbl_Articles WHERE ArticleID=1574670 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=1574670 LIMIT 0,1
select * from tbl_Articles_sphinx where id=1574670 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(843081,584280,1005122,566921,782645,787356,3498483,875584,94820,730272,730526,371507,623367,427635,1004049,810284,389559,1026618,692429,677858,834694,1212129,614333,678467,765245,896273,1161001,630235,1023573,2332613) ORDER BY field (ArticleID,843081,584280,1005122,566921,782645,787356,3498483,875584,94820,730272,730526,371507,623367,427635,1004049,810284,389559,1026618,692429,677858,834694,1212129,614333,678467,765245,896273,1161001,630235,1023573,2332613)