十六进制字母代表多少数字

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select * from tbl_Articles WHERE ArticleID=1321623 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=1321623 LIMIT 0,1
select * from tbl_Articles_sphinx where id=1321623 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1129395,2594039,167543,2647995,2338646,2197663,1625212,2690762,2976303,2820539,1313915,1077740,1082333,1082239,1062078,3128399,3263119,2220191,121502,1513632,1092300,2814759,131679,2565504,1088802,1097621,1090835,121464,850233,1123653) ORDER BY field (ArticleID,1129395,2594039,167543,2647995,2338646,2197663,1625212,2690762,2976303,2820539,1313915,1077740,1082333,1082239,1062078,3128399,3263119,2220191,121502,1513632,1092300,2814759,131679,2565504,1088802,1097621,1090835,121464,850233,1123653)