简述代位权行使的条件是什么

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select * from tbl_Articles WHERE ArticleID=1888921 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=1888921 LIMIT 0,1
select * from tbl_Articles_sphinx where id=1888921 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1072903,1064833,1086514,1091731,1044426,1123655,1062602,3449156,1084469,3315151,1064447,1068874,1097097,1068358,1086698,1113037,1099075,1121528,1121170,1094987,1065053,1094191,1070650,1131699,1110858,1093483,1059801,1105759,1052807,1094615) ORDER BY field (ArticleID,1072903,1064833,1086514,1091731,1044426,1123655,1062602,3449156,1084469,3315151,1064447,1068874,1097097,1068358,1086698,1113037,1099075,1121528,1121170,1094987,1065053,1094191,1070650,1131699,1110858,1093483,1059801,1105759,1052807,1094615)