512有什么特殊含义

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select * from tbl_Articles WHERE ArticleID=2455354 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=2455354 LIMIT 0,1
select * from tbl_Articles_sphinx where id=2455354 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1122278,1087705,1069867,1129811,1126596,1123959,1123104,1093400,1106028,1123211,1086696,1121532,1123384,1112396,1122405,1108173,1101523,1121120,1123589,1080531,1121214,1107825,1123317,1104345,1119454,1128687,1089444,1100981,1109549,1103068) ORDER BY field (ArticleID,1122278,1087705,1069867,1129811,1126596,1123959,1123104,1093400,1106028,1123211,1086696,1121532,1123384,1112396,1122405,1108173,1101523,1121120,1123589,1080531,1121214,1107825,1123317,1104345,1119454,1128687,1089444,1100981,1109549,1103068)