return me the author in the " University of Michigan " in Databases area whose papers have more than 5000 total citations .
SELECT t1.name FROM domain_author AS t6 JOIN author AS t1 ON t6.aid  =  t1.aid JOIN DOMAIN AS t3 ON t3.did  =  t6.did JOIN organization AS t5 ON t5.oid  =  t1.oid JOIN writes AS t2 ON t2.aid  =  t1.aid JOIN publication AS t4 ON t2.pid  =  t4.pid WHERE t3.name  =  "Databases" AND t5.name  =  "University of Michigan" GROUP BY t1.name HAVING SUM ( t4.citation_num )  >  5000;
SELECT t1.name FROM domain_author AS t6 JOIN author AS t1 ON t6.aid  =  t1.aid JOIN DOMAIN AS t3 ON t3.did  =  t6.did JOIN organization AS t5 ON t5.oid  =  t1.oid JOIN writes AS t2 ON t2.aid  =  t1.aid JOIN publication AS t4 ON t2.pid  =  t4.pid WHERE t3.name  =  "Databases" AND t5.name  =  "University of Michigan" GROUP BY t1.name HAVING SUM ( t4.citation_num )  >  5000;
[{'Nenhum': 'Nenhum resultado encontrado'}]