Лаба 2 / 3. min max sum avg

/*a) Сумме значений в одном из числовых столбцов*/
select sum(Cost) as total_cost from Treaty




/*b) Среднем значении числового столбца*/
select avg(Registr) as avg_reg from [User]




/*c) Минимальном и максимальном значениях в двух разнотипных столбцах*/
select min(PatrolID) as min_id, max(Chief) as max_chief from Action




/*d) Общем количестве значений в одном из столбцов*/
select count(TypeBalcony) as balcon_cnt from Flat

/*e) Количестве строк в каждой таблице*/

select count(*) as cnt, 'Action' as tbl_name from Action
Union
select count(*) as cnt, 'Flat' as tbl_name from Flat
Union
select count(*) as cnt, 'Treaty' as tbl_name from Treaty
Union
select count(*) as cnt, 'User' as tbl_name from [User]