没有k是什么意思

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select * from tbl_Articles WHERE ArticleID=4909836 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=4909836 LIMIT 0,1
select * from tbl_Articles_sphinx where id=4909836 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(3947850,3664577,3664562,3621045,3608058,3606482,3606477,3606473,3606471,3606470,3606468,3606458,3606457,3606413,3606410,3606409,3593529,3578229,3578227,3578226,3578173,3578172,3578170,3578169,3578165,3578164,3578154,3578151,3578145,3578142) ORDER BY field (ArticleID,3947850,3664577,3664562,3621045,3608058,3606482,3606477,3606473,3606471,3606470,3606468,3606458,3606457,3606413,3606410,3606409,3593529,3578229,3578227,3578226,3578173,3578172,3578170,3578169,3578165,3578164,3578154,3578151,3578145,3578142)