Plz convert this SQL code to ORALCE

Question

select title,
case when right(title , 2) = 12 then cast(left(title,2) + 1 as varchar(2)) + cast('01' as varchar(2))
else title + 1 end next_title ,
case when right(title,2) = '01' then cast(left(title,2) - 1 as varchar(2)) + cast('12' as varchar(2))
else title - 1 end prev_title
from strdc_admin.st_glt_shipment
group by title
order by title

Answer 1

Hi,
Wouldn't it be better if you first explained what this is supposed to do:
  select title
        ,case
            when right(title, 2) = 12
            then
               cast(left(title, 2) + 1 as varchar(2)) + cast('01' as varchar(2))
            else
               title + 1
         end
            next_title
        ,case
            when right(title, 2) = '01'
            then
               cast(left(title, 2) - 1 as varchar(2)) + cast('12' as varchar(2))
            else
               title - 1
         end
            prev_title
    from strdc_admin.st_glt_shipment
group by title
order by titleI mean, there seems to be some confusion about data types. First you have
when right(title, 2) = 12which indicates title is numeric.
Later on you have
when right(title, 2) = '01'which indicates that title is of char type.
(My guess is that right and left are like substr with positive and negative positions)
Next you have
cast(left(title, 2) + 1 as varchar(2)) + cast('01' as varchar(2))First part, seems to indicate that title is numeric, but what does the second + mean. Is that concatenation?
If not, you have some really confusing implicit type conversions.
And why do you do this:
cast('01' as varchar(2))'01' is already of char datatype, so why cast it?
Please return once you have worked a little more on your question.
Regards
Peter