summ/count

select
    sum(p.price) summ,
    count(c.id ) as cnt
From contract_eshop.contract As c
 Inner Join contract_eshop.contract_sign As s On (c.sign_id=s.id)
 Inner Join contract_eshop.contract_status As cst On (c.status_id=cst.id)
 Inner Join contract_eshop.contract_sign_price_info As p On (s.price_info_id=p.id)
where extract(year from s.comming_sign_date)=2023