i ahave 2 simple count queries:
select count (*) t_object select count (*) t_diagram
how simplest way combine result (sum)?
use union all
2 different count:
select count (*), 't_object count' t_object union select count (*), 't_diagram count' t_diagram
to sum of counts, use derived table:
select sum(dt.cnt) ( select count(*) cnt t_object union select count(*) cnt t_diagram ) dt
or, use sub-query:
select count(*) + (select count(*) t_diagram) t_object
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