From: | Mike Martin <redtux1(at)gmail(dot)com> |
---|---|
To: | pgsql-general(at)postgresql(dot)org |
Subject: | Array_agg and dimensions in Array |
Date: | 2019-01-13 23:05:21 |
Message-ID: | CAOwYNKa-4FCUHe21WwfNSDg9p_-AMVwrW8RitqYonoY1+1+Lqg@mail.gmail.com |
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Lists: | pgsql-general |
I have come across a problem which I cant seem to solve in a nice way
Basically I have a (small) table of tags
What I need to is combine two concatenated fields with a literal value as
an array element.
First thought was using array_agg with a pre-created array as
select array_agg(ARRAY['-metadata',optname||'='||optvalue])) metaopt from
encodeopts
where alias is not null and opttype in ('tag','tagn')
group by transref,fileid ) a
However this results in a multi-dimensional array, rather than a single
dimensioned one, which makes it impossible to join with the rest of an
array created elsewhere in the query
This works, but is very cludgy
select ARRAY['-map_metadata','-1']||array_agg(metaopt) from
(select unnest(array_agg(ARRAY['-metadata',optname||'='||optvalue]))
metaopt from encodeopts
where alias is not null and opttype in ('tag','tagn')
group by transref,fileid ) a
So does this
select
string_to_array(string_agg('-metadata',||'||'||optname||'='||optvalue])),'||')
metaopt from encodeopts
where alias is not null and opttype in ('tag','tagn')
group by transref,fileid
but again cludgy
Any ideas appreciated
Mike
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