Juan Backson wrote:
Hi,
In my table, I have fieldA and fieldB. At any point in time, only one
of these fields can have data in it. The other is NULL.
Instead of "select fieldA, fieldB from table", I want it to return
either fieldA or fieldB depends on whether it is NULL or not.
The reason is because I want to use "select
array_to_string(array_accum(field A or field B) ,',') from table.
Is it possible to do it that way?
Thanks,
JB
The two main ways of doing this are COALESCE(fieldA, fieldB)
http://www.postgresql.org/docs/8.3/interactive/functions-conditional.html#AEN14484
and CASE WHEN fieldA IS NULL THEN fieldB ELSE fieldA END;
http://www.postgresql.org/docs/8.3/interactive/functions-conditional.html#AEN14434
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