什么是正整数

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select * from tbl_Articles WHERE ArticleID=2300643 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=2300643 LIMIT 0,1
select * from tbl_Articles_sphinx where id=2300643 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(2373985,1095604,1956050,1921968,2573605,1175949,1092280,382182,1154170,1085124,2894988,1138525,468118,796653,1629192,2126285,489586,1064232,1453296,1008286,507588,1693795,2810453,2800020,601016,2734928,889519,2060826,1111360,1304635) ORDER BY field (ArticleID,2373985,1095604,1956050,1921968,2573605,1175949,1092280,382182,1154170,1085124,2894988,1138525,468118,796653,1629192,2126285,489586,1064232,1453296,1008286,507588,1693795,2810453,2800020,601016,2734928,889519,2060826,1111360,1304635)