将日期格式化为文字

Question

我想显示部门中的员工达到二十周年工作周期的日期。这是我有：

select e.last_name, e.department_id, add_months(min(h.start_date), 240) as "20 Year Anniversary" 
    from employees e 
    inner join job_history h 
    on h.employee_id = e.employee_id 
    group by e.department_id, e.last_name; 

这显示：

Last_Name Department_ID 20 Year Anniversary 
    1 Hartstein    20 17-FEB-16 
    2 Bob     90 21-SEP-09 

等。但我想以这种格式显示日期：一月二十一日，一九八二年。我将如何格式化日期？

Answer 1

我想这是你在找。 TO_CHAR日期formatting.Check了甲骨文

http://docs.oracle.com/cd/B19306_01/server.102/b14200/functions180.htm

select e.last_name, e.department_id,to_char(add_months(min(h.start_date), 240),'Month fmDdsp, Year') as "20 Year Anniversary" 
    from employees e 
    inner join job_history h 
    on h.employee_id = e.employee_id 
    group by e.department_id, e.last_name;