怎样计算密度

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select * from tbl_Articles WHERE ArticleID=1610399 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=1610399 LIMIT 0,1
select * from tbl_Articles_sphinx where id=1610399 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(110922,1047637,125267,117179,120089,1718337,2497763,337629,115767,133927,133786,2310484,128880,114518,1127475,112880,2596564,1583637,2365507,113026,120328,1048438,114834,121066,3371612,2917222,108442,116531,222782,1709464) ORDER BY field (ArticleID,110922,1047637,125267,117179,120089,1718337,2497763,337629,115767,133927,133786,2310484,128880,114518,1127475,112880,2596564,1583637,2365507,113026,120328,1048438,114834,121066,3371612,2917222,108442,116531,222782,1709464)