算式中只有加减法属于什么运算

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select * from tbl_Articles WHERE ArticleID=644740 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=644740 LIMIT 0,1
select * from tbl_Articles_sphinx where id=644740 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1062702,1080817,1077890,1065195,1084703,1068154,1063251,1059801,1050423,1060645,1045911,1050959,1073387,1063237,1067017,1065331,987401,1080799,1041849,1045697,1079437,1081847,1052749,1078869,1089560,1088974,1051403,1073822,1056798,1062230) ORDER BY field (ArticleID,1062702,1080817,1077890,1065195,1084703,1068154,1063251,1059801,1050423,1060645,1045911,1050959,1073387,1063237,1067017,1065331,987401,1080799,1041849,1045697,1079437,1081847,1052749,1078869,1089560,1088974,1051403,1073822,1056798,1062230)