oracle中如何实现自增长列

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select * from tbl_Articles WHERE ArticleID=2998546 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=2998546 LIMIT 0,1
select * from tbl_Articles_sphinx where id=2998546 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(2375205,2998546,1998987,3417898,3282486,1062566,197395,1791727,2171513,583304,1424177,2246494,1122124,1057710,2366098,1065393,1057641,1919214,1492702,2352352,337188,1046790,1423827,1045085,1130390,2078614,1404403,121362,244936,2190742) ORDER BY field (ArticleID,2375205,2998546,1998987,3417898,3282486,1062566,197395,1791727,2171513,583304,1424177,2246494,1122124,1057710,2366098,1065393,1057641,1919214,1492702,2352352,337188,1046790,1423827,1045085,1130390,2078614,1404403,121362,244936,2190742)