什么是代数式

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select * from tbl_Articles WHERE ArticleID=1202229 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=1202229 LIMIT 0,1
select * from tbl_Articles_sphinx where id=1202229 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(867769,516640,2752035,1140876,700290,1120896,1175949,1086812,1105339,2012780,1539363,2438523,1115406,1905428,2250036,1784594,827838,1096218,1111942,2957577,559472,1824136,1095894,1138525,1200306,1116697,1187802,891123,1098377,745699) ORDER BY field (ArticleID,867769,516640,2752035,1140876,700290,1120896,1175949,1086812,1105339,2012780,1539363,2438523,1115406,1905428,2250036,1784594,827838,1096218,1111942,2957577,559472,1824136,1095894,1138525,1200306,1116697,1187802,891123,1098377,745699)