Off the top of my head, I think you could do this using dynamic (execute) SQL in a function. However, it is going to be messy, possibly slow and likely fragile. You would need to query the catalogue to get the column names in the table and then build the SQL dynamically 'on the fly'.
Without having more detail, my spider sense tells me you have the wrong table/relationship design. While you may be able to get it to work, it is likely you will run into constant problems and additional complexity that could be avoided with a different design. You really want a design where your queries are driven by the data in your tables and not by the names of columns. I would seriously consider re-examining your schema design, look at how your design fits in with the normal forms and adapt as necessary.
Tim
On Wed, 29 Aug 2018 at 15:10, ss <ss@xxxxxxxxxxx> wrote:
I have a table with many years as columns. y1976, y2077, .. ,
y2019,y2020 I want to dynamically return a column from a function.
select * from FUNCTION('y2016') .....
select t1.cola t1.colb, t1.colc, t2.y2016 from ..... Where t2.y2016 != 0;
or if I select year y2012 I want FUNCTION('y2012')
select t1.cola t1.colb, t1.colc, t2.y2012 from ..... Where t2.y2012 != 0;
to generalize
select * from FUNCTION( year_column )
select t1.cola t1.colb, t1.colc, t2.year_column from ..... Where
t2.year_column != 0;
is it possible? if so how?
regards,
Tim
--
Tim Cross