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
