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create table Employee(id int,name varchar(10)); insert into Employee values(1,"ruhi"); insert into Employee values(2,"Suhi"); insert into Employee values(3,"nuhi"); insert into Employee values(); insert into Employee values(5,"luhi"); insert into Employee values(7,"ouhi"); insert into Employee values(7,"ouhi"); select * from Employee; select id,name,count(*) as cn from Employee group by id,name having count(*)>1; select id,name from Employee where id is null or id='';

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