stored procedures - add distinct inside concat in mysql -


i have following query:

set @allochours =( select concat('select project_id,em.doj doj,em.dor dor , distinct r.alloc_date alloc_count,em.emp_code,em.dept_id employee_master em left outer join  requestor_daily_report r on ( em.emp_code=r.emp_code)  inner join project_master m on m.project_auto_id=r.project_auto_id inner join department_master d on m.dept_id=d.dept_id  group date(r.alloc_date)'));

i error when use distinct inside have select distinct values of alloc_date. how can achieve me


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