r是什么档位

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select * from tbl_Articles WHERE ArticleID=516521 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=516521 LIMIT 0,1
select * from tbl_Articles_sphinx where id=516521 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1087779,1073218,1073732,1109843,1058085,1067035,1104745,983947,1072713,1100308,1062580,1120410,1087351,1102222,1073772,1105645,1088544,1085480,1073526,1072268,1081819,1073385,1101394,1052887,1080593,1108976,1110730,1103121,1074865,1051917) ORDER BY field (ArticleID,1087779,1073218,1073732,1109843,1058085,1067035,1104745,983947,1072713,1100308,1062580,1120410,1087351,1102222,1073772,1105645,1088544,1085480,1073526,1072268,1081819,1073385,1101394,1052887,1080593,1108976,1110730,1103121,1074865,1051917)