确定洞口位置考虑哪些因素?

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select * from tbl_Articles WHERE ArticleID=891705 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=891705 LIMIT 0,1
select * from tbl_Articles_sphinx where id=891705 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(719906,382858,2998437,4044362,1878775,726087,2714131,2587125,3480280,767453,3385208,3292605,622599,2158181,1165003,3137084,3575112,891705,1199901,790794,1154778,1860979,517842,1004506,525705,3599252,741486,3254380,3625397,1688712) ORDER BY field (ArticleID,719906,382858,2998437,4044362,1878775,726087,2714131,2587125,3480280,767453,3385208,3292605,622599,2158181,1165003,3137084,3575112,891705,1199901,790794,1154778,1860979,517842,1004506,525705,3599252,741486,3254380,3625397,1688712)