SQL Server
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select date(dt), strftime('%H', dt), max(un)
from dS
where dt between datetime('now','localtime','-24 hours') and datetime('now','localtime','-0 hours');--тут нужные сутки
group by date(dt), strftime('%H', dt)select COALESCE(price, 0) + COALESCE(price2, 0) + COALESCE(price3,0) as suma from prices