r和l哪个是左哪个是右

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select * from tbl_Articles WHERE ArticleID=3505078 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=3505078 LIMIT 0,1
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SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1106926,1091617,1121824,1086260,1090513,1108347,1100755,1096689,1089910,1081993,1109268,1303515,1098711,1121964,1119942,1104013,1115430,1094853,1100402,1099483,1119622,1092702,663604,1120651,1112340,1119253,1108898,1093963,1109426,1096879) ORDER BY field (ArticleID,1106926,1091617,1121824,1086260,1090513,1108347,1100755,1096689,1089910,1081993,1109268,1303515,1098711,1121964,1119942,1104013,1115430,1094853,1100402,1099483,1119622,1092702,663604,1120651,1112340,1119253,1108898,1093963,1109426,1096879)