常数是什么

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select * from tbl_Articles WHERE ArticleID=2381843 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=2381843 LIMIT 0,1
select * from tbl_Articles_sphinx where id=2381843 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1113111,2964226,369817,1117333,392693,87074,1105922,1090068,1121694,410190,404857,1086618,1115811,86859,391003,1084579,389877,415562,394071,1116589,408602,87052,380487,363881,376171,1599336,381034,86796,390723,432204) ORDER BY field (ArticleID,1113111,2964226,369817,1117333,392693,87074,1105922,1090068,1121694,410190,404857,1086618,1115811,86859,391003,1084579,389877,415562,394071,1116589,408602,87052,380487,363881,376171,1599336,381034,86796,390723,432204)