EXP是哪一种运算

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select * from tbl_Articles WHERE ArticleID=1917868 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=1917868 LIMIT 0,1
select * from tbl_Articles_sphinx where id=1917868 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1080116,1070614,1065449,1082303,1064511,1057904,983947,1112398,1077984,1067351,1126076,1113299,987495,1062062,1088870,1073528,1048406,1087239,1061942,1065729,1077080,1060355,1063417,1086608,1089842,1083486,1070868,1081847,1069505,1052807) ORDER BY field (ArticleID,1080116,1070614,1065449,1082303,1064511,1057904,983947,1112398,1077984,1067351,1126076,1113299,987495,1062062,1088870,1073528,1048406,1087239,1061942,1065729,1077080,1060355,1063417,1086608,1089842,1083486,1070868,1081847,1069505,1052807)