什么是标准差

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select * from tbl_Articles WHERE ArticleID=86160 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=86160 LIMIT 0,1
select * from tbl_Articles_sphinx where id=86160 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1095894,1114422,1843616,1180232,1225032,1102750,2468485,1120115,1093851,790648,1770732,983949,2550692,2009147,387602,1310518,1200306,1105237,756635,592570,1305368,1662951,1077462,2709651,561606,533043,1304309,1208464,739777,1138904) ORDER BY field (ArticleID,1095894,1114422,1843616,1180232,1225032,1102750,2468485,1120115,1093851,790648,1770732,983949,2550692,2009147,387602,1310518,1200306,1105237,756635,592570,1305368,1662951,1077462,2709651,561606,533043,1304309,1208464,739777,1138904)