两直线垂直的条件是什么

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select * from tbl_Articles WHERE ArticleID=1486326 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=1486326 LIMIT 0,1
select * from tbl_Articles_sphinx where id=1486326 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(593936,1085200,1323822,1100589,1113323,1121792,536484,617048,1114034,415788,1119281,2997026,395003,1090599,612234,2964226,1304309,3357039,394930,1091009,519581,424494,603868,520993,538444,527192,537634,1093535,1121694,429175) ORDER BY field (ArticleID,593936,1085200,1323822,1100589,1113323,1121792,536484,617048,1114034,415788,1119281,2997026,395003,1090599,612234,2964226,1304309,3357039,394930,1091009,519581,424494,603868,520993,538444,527192,537634,1093535,1121694,429175)