等差数列怎么求项数

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select * from tbl_Articles WHERE ArticleID=1542633 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=1542633 LIMIT 0,1
select * from tbl_Articles_sphinx where id=1542633 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1093641,1047629,1104127,1080193,1133267,1108413,1046110,964762,1088541,1050221,1130746,1057010,1073891,1129277,1124233,1110844,1114686,1088746,1099253,1117566,1067245,1085945,1082318,1058265,1102166,1101407,1105363,984640,1082962,1115591) ORDER BY field (ArticleID,1093641,1047629,1104127,1080193,1133267,1108413,1046110,964762,1088541,1050221,1130746,1057010,1073891,1129277,1124233,1110844,1114686,1088746,1099253,1117566,1067245,1085945,1082318,1058265,1102166,1101407,1105363,984640,1082962,1115591)