小数的意义是什么?

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select * from tbl_Articles WHERE ArticleID=2532270 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=2532270 LIMIT 0,1
select * from tbl_Articles_sphinx where id=2532270 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1433880,696235,1455772,1036981,1202757,1580575,1137682,890430,823671,1808081,1017476,3296563,1166944,729547,3175678,2288115,597109,2025970,499712,1602664,692199,1107021,1019843,1429997,756329,1620211,748780,387788,566921,1134543) ORDER BY field (ArticleID,1433880,696235,1455772,1036981,1202757,1580575,1137682,890430,823671,1808081,1017476,3296563,1166944,729547,3175678,2288115,597109,2025970,499712,1602664,692199,1107021,1019843,1429997,756329,1620211,748780,387788,566921,1134543)