什么情况下函数无极值

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select * from tbl_Articles WHERE ArticleID=1672220 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=1672220 LIMIT 0,1
select * from tbl_Articles_sphinx where id=1672220 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1065195,1072809,1073588,1080997,1088584,1078134,1078901,1077012,1053204,1073322,1071701,1072753,1054182,1088926,1045643,1051403,1091267,1047705,1066622,1064977,1045946,987495,1078076,982771,1065683,1077084,1089251,1004919,1071501,1060503) ORDER BY field (ArticleID,1065195,1072809,1073588,1080997,1088584,1078134,1078901,1077012,1053204,1073322,1071701,1072753,1054182,1088926,1045643,1051403,1091267,1047705,1066622,1064977,1045946,987495,1078076,982771,1065683,1077084,1089251,1004919,1071501,1060503)