头位是什么意思

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select * from tbl_Articles WHERE ArticleID=408102 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=408102 LIMIT 0,1
select * from tbl_Articles_sphinx where id=408102 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(440431,392693,1114190,1110247,1085860,1111644,1122372,472881,492530,1122400,380061,486279,1092341,393147,86796,431963,1122831,473373,87144,1099443,435548,481190,403481,1085934,486954,1117401,1101099,446252,2573605,481950) ORDER BY field (ArticleID,440431,392693,1114190,1110247,1085860,1111644,1122372,472881,492530,1122400,380061,486279,1092341,393147,86796,431963,1122831,473373,87144,1099443,435548,481190,403481,1085934,486954,1117401,1101099,446252,2573605,481950)