小数分为哪几种什么叫循环小数

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select * from tbl_Articles WHERE ArticleID=1787445 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=1787445 LIMIT 0,1
select * from tbl_Articles_sphinx where id=1787445 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1074312,1047285,1009146,1078705,1048158,988905,982771,1067115,1049908,1076732,1075425,1076541,1064613,1104195,1062364,1101623,1079384,1076554,1065281,1076025,1067924,1083532,3127132,1071697,1077756,1052887,1054926,1080251,1073732,1376846) ORDER BY field (ArticleID,1074312,1047285,1009146,1078705,1048158,988905,982771,1067115,1049908,1076732,1075425,1076541,1064613,1104195,1062364,1101623,1079384,1076554,1065281,1076025,1067924,1083532,3127132,1071697,1077756,1052887,1054926,1080251,1073732,1376846)