弧是什么意思

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select * from tbl_Articles WHERE ArticleID=434126 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=434126 LIMIT 0,1
select * from tbl_Articles_sphinx where id=434126 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1099635,1102804,1104430,475370,1088528,2964226,2976915,1099461,489839,3136381,403263,489019,1113135,1120364,1094961,87052,363263,473694,1112893,400522,411573,370016,386449,365808,1119798,1114310,387272,481684,388179,1089050) ORDER BY field (ArticleID,1099635,1102804,1104430,475370,1088528,2964226,2976915,1099461,489839,3136381,403263,489019,1113135,1120364,1094961,87052,363263,473694,1112893,400522,411573,370016,386449,365808,1119798,1114310,387272,481684,388179,1089050)