极值点的导数一定为0吗

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select * from tbl_Articles WHERE ArticleID=3060808 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=3060808 LIMIT 0,1
select * from tbl_Articles_sphinx where id=3060808 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1071972,1046963,1099553,1077100,1072797,1082318,1066090,1078424,1054388,1100495,1088605,1091197,1078903,1104973,1086612,1110850,1107062,1065917,1074618,1089040,1108051,1116813,1112058,1118440,993285,1060241,1115621,1121414,1078677,1112642) ORDER BY field (ArticleID,1071972,1046963,1099553,1077100,1072797,1082318,1066090,1078424,1054388,1100495,1088605,1091197,1078903,1104973,1086612,1110850,1107062,1065917,1074618,1089040,1108051,1116813,1112058,1118440,993285,1060241,1115621,1121414,1078677,1112642)