变异系数是什么

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select * from tbl_Articles WHERE ArticleID=3118778 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=3118778 LIMIT 0,1
select * from tbl_Articles_sphinx where id=3118778 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1565566,987146,2973148,541710,3470251,2892108,953172,576611,2583898,3508910,1747939,516718,3997720,3329098,3243543,396350,3511150,3369686,3493164,421153,632572,1216684,3467392,3524899,1040050,1751255,1158553,3433014,2814581,2159345) ORDER BY field (ArticleID,1565566,987146,2973148,541710,3470251,2892108,953172,576611,2583898,3508910,1747939,516718,3997720,3329098,3243543,396350,3511150,3369686,3493164,421153,632572,1216684,3467392,3524899,1040050,1751255,1158553,3433014,2814581,2159345)