下坡时应该用几挡？

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select * from tbl_Articles WHERE ArticleID=3126400 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=3126400 LIMIT 0,1
select * from tbl_Articles_sphinx where id=3126400 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(772059,434970,821147,648505,885575,659160,695980,448555,612420,534125,572910,826433,822766,713869,654930,930588,568191,410218,818494,442078,1201751,865931,555032,1589556,547043,669018,792797,705971,508336,817121) ORDER BY field (ArticleID,772059,434970,821147,648505,885575,659160,695980,448555,612420,534125,572910,826433,822766,713869,654930,930588,568191,410218,818494,442078,1201751,865931,555032,1589556,547043,669018,792797,705971,508336,817121)