如何判断对映异构体

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select * from tbl_Articles WHERE ArticleID=1518611 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=1518611 LIMIT 0,1
select * from tbl_Articles_sphinx where id=1518611 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1078114,2083957,2165564,2013940,937233,1129473,673826,129445,1079952,1065393,993145,984640,276445,166586,1670051,1315255,2554675,1074270,810309,915241,916438,1938766,1060531,330478,1130328,1127757,671698,907519,751467,1664183) ORDER BY field (ArticleID,1078114,2083957,2165564,2013940,937233,1129473,673826,129445,1079952,1065393,993145,984640,276445,166586,1670051,1315255,2554675,1074270,810309,915241,916438,1938766,1060531,330478,1130328,1127757,671698,907519,751467,1664183)