不字下面一横是什么字

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select * from tbl_Articles WHERE ArticleID=1832229 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=1832229 LIMIT 0,1
select * from tbl_Articles_sphinx where id=1832229 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1096993,1070848,1066622,1072721,1124215,1067487,1124400,1066438,1113421,1120410,1078438,1109304,1087862,1063165,1050423,2644343,1114692,1043355,1092053,1062248,1105759,997352,1055341,1124416,1070474,1109410,1075881,1084083,1090663,1113584) ORDER BY field (ArticleID,1096993,1070848,1066622,1072721,1124215,1067487,1124400,1066438,1113421,1120410,1078438,1109304,1087862,1063165,1050423,2644343,1114692,1043355,1092053,1062248,1105759,997352,1055341,1124416,1070474,1109410,1075881,1084083,1090663,1113584)