Question

我的表列是这样的，我希望不使用UNION的情况下最后一行中所有记录的总和

$2.stringValue

预期结果将是

no_of_books
1
3
3
3
5

我已经尝试过这种方法，但是在PostgreSQL之类的Oracle中寻找更好的功能

no_of_books
    1
    3
    3
    3
    5
   15

OR

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

Answer 1

您可以将rollup与子查询一起使用：

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

但是，这将直接通过sum()完成：

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

Answer 2

使用rollup：

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);

(SQL Fiddle Demo)

行总数作为Postgresql查询结果中的最后一条记录

2 个答案: