等差前n项求和公式

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select * from tbl_Articles WHERE ArticleID=3371400 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=3371400 LIMIT 0,1
select * from tbl_Articles_sphinx where id=3371400 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(3055726,988166,3310271,752581,739465,4059251,654624,923987,1046657,2403968,599755,3522929,3319415,3323297,1139042,3490702,1664170,946334,901146,543392,750656,571602,1226948,2451155,1155192,436262,3951845,1139655,1114937,3633969) ORDER BY field (ArticleID,3055726,988166,3310271,752581,739465,4059251,654624,923987,1046657,2403968,599755,3522929,3319415,3323297,1139042,3490702,1664170,946334,901146,543392,750656,571602,1226948,2451155,1155192,436262,3951845,1139655,1114937,3633969)