如何计算SPC控制线

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select * from tbl_Articles WHERE ArticleID=575135 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=575135 LIMIT 0,1
select * from tbl_Articles_sphinx where id=575135 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(342310,1077000,2641460,585298,1865331,1055405,1674404,1962727,1063395,2539146,596845,2517541,1123281,2498192,2798263,2261532,1096837,2921535,1127529,3299673,3090557,2258101,2106667,1123835,1132487,1125060,330744,1082173,1841268,107779) ORDER BY field (ArticleID,342310,1077000,2641460,585298,1865331,1055405,1674404,1962727,1063395,2539146,596845,2517541,1123281,2498192,2798263,2261532,1096837,2921535,1127529,3299673,3090557,2258101,2106667,1123835,1132487,1125060,330744,1082173,1841268,107779)