n和s代表什么方向

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select * from tbl_Articles WHERE ArticleID=2641960 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=2641960 LIMIT 0,1
select * from tbl_Articles_sphinx where id=2641960 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1085701,1131739,1111484,1066370,1123897,1123231,1116039,1125377,1124125,1126236,1128713,1066790,1122911,1120884,1123891,1124267,1122847,1123503,1126138,1115541,1111154,1087243,1112570,1073349,1126004,1008790,1103101,1106769,1120679,1109933) ORDER BY field (ArticleID,1085701,1131739,1111484,1066370,1123897,1123231,1116039,1125377,1124125,1126236,1128713,1066790,1122911,1120884,1123891,1124267,1122847,1123503,1126138,1115541,1111154,1087243,1112570,1073349,1126004,1008790,1103101,1106769,1120679,1109933)