已知密度函数怎么求分布函数

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select * from tbl_Articles WHERE ArticleID=187342 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=187342 LIMIT 0,1
select * from tbl_Articles_sphinx where id=187342 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1492590,1081255,1064667,2562914,187342,2762390,1099411,1075498,1126404,1075760,1045071,1593408,1103724,1086468,1131715,1119712,1126740,2476165,1133061,1106777,1085460,1063841,1112402,1098155,1075602,1118312,1048626,1071105,1126488,2827147) ORDER BY field (ArticleID,1492590,1081255,1064667,2562914,187342,2762390,1099411,1075498,1126404,1075760,1045071,1593408,1103724,1086468,1131715,1119712,1126740,2476165,1133061,1106777,1085460,1063841,1112402,1098155,1075602,1118312,1048626,1071105,1126488,2827147)