怎样在两个字的中间打上点号

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select * from tbl_Articles WHERE ArticleID=470870 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=470870 LIMIT 0,1
select * from tbl_Articles_sphinx where id=470870 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1049440,1106048,1133185,585298,1105065,1071239,1054676,1049862,1071821,1085118,1091625,1095700,1094683,1087793,1088694,1047441,1105795,1077102,999216,986890,1049870,1089526,1087821,1052425,1046512,1070963,1092367,1112871,1069956,1102770) ORDER BY field (ArticleID,1049440,1106048,1133185,585298,1105065,1071239,1054676,1049862,1071821,1085118,1091625,1095700,1094683,1087793,1088694,1047441,1105795,1077102,999216,986890,1049870,1089526,1087821,1052425,1046512,1070963,1092367,1112871,1069956,1102770)