开关l和l1是什么意思

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select * from tbl_Articles WHERE ArticleID=1119297 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=1119297 LIMIT 0,1
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SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1102080,1304623,1129687,1108329,1115129,1121408,1098559,1118789,1091117,1071281,1113902,1105189,1101483,1091405,1084988,1109146,1117321,1112516,1100755,1103512,1082489,1119099,1104489,1117171,1084311,1128079,1106874,1099237,1112014,1115477) ORDER BY field (ArticleID,1102080,1304623,1129687,1108329,1115129,1121408,1098559,1118789,1091117,1071281,1113902,1105189,1101483,1091405,1084988,1109146,1117321,1112516,1100755,1103512,1082489,1119099,1104489,1117171,1084311,1128079,1106874,1099237,1112014,1115477)