开关n和l分别代表什么

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select * from tbl_Articles WHERE ArticleID=1113742 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=1113742 LIMIT 0,1
select * from tbl_Articles_sphinx where id=1113742 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1084241,1083069,2189337,1109765,1078168,1103955,1117568,1118300,1110486,1119776,1099831,1090853,1119622,1116607,1121948,1102646,1103606,1109775,1103439,658220,1092085,3414809,1092279,1101691,1094853,1098115,1096635,1112869,1116573,1099237) ORDER BY field (ArticleID,1084241,1083069,2189337,1109765,1078168,1103955,1117568,1118300,1110486,1119776,1099831,1090853,1119622,1116607,1121948,1102646,1103606,1109775,1103439,658220,1092085,3414809,1092279,1101691,1094853,1098115,1096635,1112869,1116573,1099237)