三个代表是什么

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select * from tbl_Articles WHERE ArticleID=2570349 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=2570349 LIMIT 0,1
select * from tbl_Articles_sphinx where id=2570349 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1105237,1478291,1110291,358643,453813,1120896,1154510,1109090,365532,365916,1104545,2546870,1097099,363263,360222,1106703,380299,1002911,366873,1093222,781885,1989626,361035,1304309,711548,369587,1147834,386283,1090438,1310242) ORDER BY field (ArticleID,1105237,1478291,1110291,358643,453813,1120896,1154510,1109090,365532,365916,1104545,2546870,1097099,363263,360222,1106703,380299,1002911,366873,1093222,781885,1989626,361035,1304309,711548,369587,1147834,386283,1090438,1310242)