在一个查询中将SQL中的日期从一种格式转换为多种格式

Question

I'm taking SQL in school and am really new to it. We are using Oracle APEX for school. I need to write ONE query to convert a date into multiple formats. I thought I could do this by writing the statement with a substitution variable so I could input what the new format would be, but it isn't working exactly right. Below is my attempt at the one statement:

 SELECT TO_CHAR(TO_DATE('04-Jan-2008', 'DD-Mon-YYYY'), :xx) AS "Date"
 FROM dual; 

When I click "Run", the variables box pops up,and I type in the below so that it shows as "January 4th, 2008". I've tried it with and without quote marks. "January 4th" shows up, but not the comma and the year.

 fmMonth ddth, YYYY   

Any thoughts? Thanks for your input!

Answer 1

Assuming the item where you enter the date mask is named P1_MASK, you'd have to refer it in your query with notation "& + item_name + .":

SELECT to_char(TO_DATE('04-Ene-2008', 'DD-Mon-YYYY'), '&P1_MASK.') AS "Date"
  FROM dual; 

Answer 2

I figured it out. I added a REPLACE function to it.

SELECT REPLACE(TO_CHAR(TO_DATE('04-Jan-2008', 'DD-Mon-YYYY'), :xx), '-', ',') AS "Date"
FROM dual;

When the variables box pops up, I key in:

fmMonth ddth- YYYY 

It works perfectly!