什么是定语

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select * from tbl_Articles WHERE ArticleID=3094738 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=3094738 LIMIT 0,1
select * from tbl_Articles_sphinx where id=3094738 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(2482057,827838,514783,2570080,844676,621596,2064646,1111360,526622,1297353,601448,1143341,3123696,1353755,2065854,1148029,395559,860593,1178811,1119694,1304993,999699,1110247,1899825,1147833,2653658,2438523,1999780,1141539,1119798) ORDER BY field (ArticleID,2482057,827838,514783,2570080,844676,621596,2064646,1111360,526622,1297353,601448,1143341,3123696,1353755,2065854,1148029,395559,860593,1178811,1119694,1304993,999699,1110247,1899825,1147833,2653658,2438523,1999780,1141539,1119798)