请问等比和等差分别是什么意思

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select * from tbl_Articles WHERE ArticleID=155043 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=155043 LIMIT 0,1
select * from tbl_Articles_sphinx where id=155043 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1073025,1132833,1796088,1045825,1063315,983947,1111948,1045923,1992181,1057076,1063237,1078797,1070939,1981118,1051045,1072683,1078194,1068937,1592425,1070997,1061566,1096256,1067211,1584902,1113405,1052287,1078134,1078102,1072721,1061518) ORDER BY field (ArticleID,1073025,1132833,1796088,1045825,1063315,983947,1111948,1045923,1992181,1057076,1063237,1078797,1070939,1981118,1051045,1072683,1078194,1068937,1592425,1070997,1061566,1096256,1067211,1584902,1113405,1052287,1078134,1078102,1072721,1061518)