Question

I have 2 tables:

table1 contains (amount, date)
table2 contains (amount, revenue, date)

I need to:

sum table1.amount + table2.amount, sum table2.revenue
according to table1.date and table2.date

like:

select sum(table1.amount + table2.amount), sum(table2.revenue)
from table1,table2
where table1.date and table2.date = '2008-02%'

Answer 1

This will show the result for all year-month:

with table3 (amount, revenue, date) as
(
    select amount, 0, date from table1
    union all
    select cost, revenue, date from table2
)
select year(date), month(date), sum(amount), sum(revenue)
from table3
group by year(date), month(date)
order by year(date), month(date);