正方形对角线怎么计算

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select * from tbl_Articles WHERE ArticleID=883944 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=883944 LIMIT 0,1
select * from tbl_Articles_sphinx where id=883944 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(456557,1778292,521784,413392,1093961,362451,433952,489303,81195,365999,465532,481364,1121198,497408,372346,359422,86091,363203,506088,561122,450120,414896,383037,464510,499303,376906,549016,415176,432066,483712) ORDER BY field (ArticleID,456557,1778292,521784,413392,1093961,362451,433952,489303,81195,365999,465532,481364,1121198,497408,372346,359422,86091,363203,506088,561122,450120,414896,383037,464510,499303,376906,549016,415176,432066,483712)