如何判断图象与x轴有几个交点

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select * from tbl_Articles WHERE ArticleID=2820439 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=2820439 LIMIT 0,1
select * from tbl_Articles_sphinx where id=2820439 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1459455,1080432,2727450,1125013,1041611,1069401,1072831,1131015,1594020,1079826,1089840,1414852,1127481,1053874,1088624,1130596,1076255,1110405,1116727,1098077,1121580,1126230,1103238,1106438,1127655,1052980,1092331,1080787,1130314,1050025) ORDER BY field (ArticleID,1459455,1080432,2727450,1125013,1041611,1069401,1072831,1131015,1594020,1079826,1089840,1414852,1127481,1053874,1088624,1130596,1076255,1110405,1116727,1098077,1121580,1126230,1103238,1106438,1127655,1052980,1092331,1080787,1130314,1050025)