除与除以的区别是什么

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select * from tbl_Articles WHERE ArticleID=1287719 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=1287719 LIMIT 0,1
select * from tbl_Articles_sphinx where id=1287719 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(509788,561256,379932,372494,1102879,1216648,1089239,1107106,1103196,511395,1096969,499365,1118142,429343,386020,550944,1290456,1102797,509541,1102252,484667,555776,1119692,1083301,1120739,1203887,1304475,3418318,527346,364304) ORDER BY field (ArticleID,509788,561256,379932,372494,1102879,1216648,1089239,1107106,1103196,511395,1096969,499365,1118142,429343,386020,550944,1290456,1102797,509541,1102252,484667,555776,1119692,1083301,1120739,1203887,1304475,3418318,527346,364304)