为什么正定不限号

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select * from tbl_Articles WHERE ArticleID=1193465 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=1193465 LIMIT 0,1
select * from tbl_Articles_sphinx where id=1193465 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(615957,638890,1867684,2519985,687793,601915,556481,400552,992808,474148,543044,2659225,366469,1128386,1003233,716535,1028134,2262588,898274,384029,896679,627715,1031912,925650,805490,388499,762783,504231,954190,460740) ORDER BY field (ArticleID,615957,638890,1867684,2519985,687793,601915,556481,400552,992808,474148,543044,2659225,366469,1128386,1003233,716535,1028134,2262588,898274,384029,896679,627715,1031912,925650,805490,388499,762783,504231,954190,460740)