样本容量与哪些因素有关

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select * from tbl_Articles WHERE ArticleID=2800508 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=2800508 LIMIT 0,1
select * from tbl_Articles_sphinx where id=2800508 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(362600,2692418,1108171,1970359,1410292,1420613,3157444,133337,107355,2108833,1082201,2218540,1990275,1542324,2563178,112634,1635667,3113795,2182264,1768058,2381808,1355814,1121858,255354,2255186,3410171,2130990,3207730,2072254,1121734) ORDER BY field (ArticleID,362600,2692418,1108171,1970359,1410292,1420613,3157444,133337,107355,2108833,1082201,2218540,1990275,1542324,2563178,112634,1635667,3113795,2182264,1768058,2381808,1355814,1121858,255354,2255186,3410171,2130990,3207730,2072254,1121734)