Combine the ORDER BY sorting columns?
Hello-I wonder if this is possible:
I would like to combine two columns of Dates (from separate tables) so that the SELECT result can be sorted (ORDER BY) based on the order of these TWO dates, not just one or the other.
Wherever a date exists in a column, the other column contains a null entry. For example:
ID-date1 - date2.
0 - draw - 12/09/09
1 08/04/09 - null.
2 - null - 06/12/09
3 08/12/09 - null.
(forgive the formatting)
Essentially, I want to leave null values and possess a solid column of dates to sort a SELECT with query. Is this possible? If so, how?
The two date columns have type DATE - they are not strings. They also store sometimes, but I don't understand as in the illustration above for simplicity. The columns are two separate tables, but who are joined with a join internal based on an ID value that connects the two (not sure if it's too big).
I am also open to any other ideas about how I could sort the results based on the two sets of dates; Looks like some kind of cartel would be the simplest or most logical (even if I'm wrong, because I can't find a way to do it).
Thank you!
Salvation;
select tableA.id, nvl(tableA.date1, tableB.date2) as combined_dt
from tableA, tableB
where tableA.id=tableB.id
order by 2
Kind regards...
Tags: Database
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