Re: Is there a better way to write this sql?

Anthony Smith wrote:
> select other_columns
> (case when TO_CHAR(expiration_dttm, 'YYYY/MM/DD') between
> '2006/06/01' and
> '2006/08/31' then 1
> when TO_CHAR(expiration_dttm, 'YYYY/MM/DD') between '2006/09/01' and
> '2006/11/31' then 2
> when TO_CHAR(expiration_dttm, 'YYYY/MM/DD') between '2006/12/01' and
> '2007/2/29' then 3
> when TO_CHAR(expiration_dttm, 'YYYY/MM/DD') between '2007/3/01' and
> '2007/5/31' then 4 end) qtr
> from common.employee_assignment order by qtr
>
> I do not want to hardcode for each fiscal year. Is there a way where I
> don't have to specify year. And notice since the quarters start with
> June 1st, my fiscal year will need to be figured out as well.
>

It looks like your fiscal year starts June first. One approach is to just look at the month of the year as follows:

select other_columns

  (case when TO_CHAR(expiration_dttm, 'MM') between '06' and '08' then 1
        when TO_CHAR(expiration_dttm, 'MM') between '09' and '11' then 2
        when TO_CHAR(expiration_dttm, 'MM') = '12' then 3
        when TO_CHAR(expiration_dttm, 'MM') between '01' and '02' then 3
        when TO_CHAR(expiration_dttm, 'MM') between '03' and '05' then 4 

   end) qtr
from common.employee_assignment order by qtr

In the manner above, you just look for your mapping of the month to its specific quarter, regardless of the calendar year.

Perhaps a more elegant solution is to do something more like this:

SELECT other_columns,MOD(ADD_MONTHS(expiration_dttm,-5),4)+1 AS qtr FROM common.employee_assignment ORDER BY qtr;

You might have to play around with the end cases to see if the above works exactly.....but it is a start.

HTH,
Brian

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Brian Peasland
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