如何判断两条直线异面啊

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select * from tbl_Articles WHERE ArticleID=2935962 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=2935962 LIMIT 0,1
select * from tbl_Articles_sphinx where id=2935962 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(751467,689106,918372,1756228,1101404,879512,1102300,1076135,856983,898469,354535,1536974,1470437,728618,1284808,1079728,832097,1102608,1736613,1362150,1110930,885036,1111796,888536,1288397,1066694,1518611,655774,1069935,1125151) ORDER BY field (ArticleID,751467,689106,918372,1756228,1101404,879512,1102300,1076135,856983,898469,354535,1536974,1470437,728618,1284808,1079728,832097,1102608,1736613,1362150,1110930,885036,1111796,888536,1288397,1066694,1518611,655774,1069935,1125151)