ora:00936 缺少表达式错误

I'm getting ORA:00936 error for the following query.Please let me know the issue in the query

SELECT convert(DATE,r.created_dt) as created_dt,
r.created_dt as time,
r.rep_id,
rt.rep_type_id,
rt.rep_type_desc
FROM t_tbm_ia_rep_2015 r,
t_tbm_ia_rep_type_2015 rt
WHERE r.rep_type_id=rt.rep_type_id
GROUP BY r.created_dt,
r.rep_id,
rt.rep_type_id,
rt.rep_type_desc
ORDER BY rt.rep_type_id

推荐答案

SELECT convert(DATE,r.created_dt) as created_dt

SQL> SELECT convert(DATE,hiredate) as created_dt from emp;
SELECT convert(DATE,hiredate) as created_dt from emp
               *
ERROR at line 1:
ORA-00936: missing expression


SQL>