用适当符号表示a是非负数

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select * from tbl_Articles WHERE ArticleID=2239746 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=2239746 LIMIT 0,1
SELECT * FROM tbl_categories where CategoryID=90022 LIMIT 0,1
select * from tbl_Articles_sphinx where id=2239746 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(3451982,2278699,2787348,542424,1155958,2736429,990042,3242697,1917474,1140073,3442299,2292463,601557,3161587,3123862,3190736,360768,3201085,571336,559622,3522001,1412610,810014,2417609,838491,495059,1081340,2099349,3494052,687534) ORDER BY field (ArticleID,3451982,2278699,2787348,542424,1155958,2736429,990042,3242697,1917474,1140073,3442299,2292463,601557,3161587,3123862,3190736,360768,3201085,571336,559622,3522001,1412610,810014,2417609,838491,495059,1081340,2099349,3494052,687534)