文献标识码a代表什么

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select * from tbl_Articles WHERE ArticleID=1197357 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=1197357 LIMIT 0,1
select * from tbl_Articles_sphinx where id=1197357 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(3132624,367305,1980901,3350546,1752705,2065485,424416,970040,3200682,3043938,1165908,2230794,939604,508352,1033301,1636076,831928,2627159,556833,3243386,2415713,1060954,2272666,1010019,2810765,655565,1043394,1154252,754214,1108535) ORDER BY field (ArticleID,3132624,367305,1980901,3350546,1752705,2065485,424416,970040,3200682,3043938,1165908,2230794,939604,508352,1033301,1636076,831928,2627159,556833,3243386,2415713,1060954,2272666,1010019,2810765,655565,1043394,1154252,754214,1108535)