什么叫自然条件包括哪些内容

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select * from tbl_Articles WHERE ArticleID=663713 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=663713 LIMIT 0,1
select * from tbl_Articles_sphinx where id=663713 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1057674,1065049,1079840,993285,1072290,1050423,1066909,1074306,1080827,1048474,1055097,1078320,1130198,1072901,1072093,1083170,1063135,1132081,1080799,1073678,1083291,1070534,1068410,1061744,1067233,1079063,1056440,1060169,1276272,1081195) ORDER BY field (ArticleID,1057674,1065049,1079840,993285,1072290,1050423,1066909,1074306,1080827,1048474,1055097,1078320,1130198,1072901,1072093,1083170,1063135,1132081,1080799,1073678,1083291,1070534,1068410,1061744,1067233,1079063,1056440,1060169,1276272,1081195)