作为Postgresql查询结果最后一条记录的行的总和

我的表列是这样的，我想要最后一行中所有记录的总和，而不使用UNION

no_of_books
1
3
3
3
5

预期结果将是

no_of_books
    1
    3
    3
    3
    5
   15

我试过这样做，但在PostgreSQL中寻找更好的功能，比如Oracle

select aa.no_of_books sum_prod  from (SELECT prodcount
FROM "table1") aa
union all
select sum(bb.sum_prod) from (
select aa.no_of_books sum_prod  from (SELECT prodcount
FROM "table1") aa ) bb

或

---

您可以对子查询使用

rollup

：

select coalesce(no_of_books, (select sum(no_of_books) from table t))
from table t
group by rollup(no_of_books);

但是，这可以通过

sum（）

直接完成：

select sum(no_of_books)
from table t
group by rollup(no_of_books);

---

使用

汇总

：

select sum(no_of_books)
  from books t
 group by rollup(no_of_books)

或

cube

select sum(no_of_books)
  from books t
 group by cube(no_of_books);

select sum(no_of_books)
  from books t
 group by cube(no_of_books);