身份证后面的x是什么意思

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select * from tbl_Articles WHERE ArticleID=1114257 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=1114257 LIMIT 0,1
select * from tbl_Articles_sphinx where id=1114257 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1112530,1085728,1122996,1127363,1124073,1107939,1060655,1086025,1129715,1109376,1110646,1119696,1113229,1099027,1118222,1103412,1131209,1305392,1130876,1123158,1130402,1105892,1305867,1108173,1126989,1082377,1129809,1305540,1119480,1129857) ORDER BY field (ArticleID,1112530,1085728,1122996,1127363,1124073,1107939,1060655,1086025,1129715,1109376,1110646,1119696,1113229,1099027,1118222,1103412,1131209,1305392,1130876,1123158,1130402,1105892,1305867,1108173,1126989,1082377,1129809,1305540,1119480,1129857)