内部查询的结果集能否与最终结果集一起显示

Question

我有一个 table 包含一些数据说

====================
Record  | Record_Count
1       |   12
3       |   87
5       |   43
6       |   54
1       |   43
3       |   32
5       |   65
6       |   43

我有一个查询 returns 按记录

分组的记录计数总和

select record,sum(record_count)
FROM table_name
WHERE <conditions>
GROUP BY tcpa_code
ORDER BY sum(record_count)

结果是这样的

====================
Record  | Record_Count
1       |   55
3       |   119
5       |   108
6       |   97

现在我还想要总计 record_count（所有记录计数的总和）。

问题是我还想要上面的结果集以及总计。

我试过这个

select sum(subquery.record_count)
from (
select record,sum(record_count)
FROM table_name
WHERE <conditions>
GROUP BY tcpa_code
ORDER BY sum(record_count) ) as subquery

但是通过使用这个我失去了个人 record_count 总和。

所以我的问题是我能否在单个查询中获得包含 record_count 每条记录总和和总计 record_count 的结果集？

Answer 1

您可以使用union来实现您需要的：

(select cast(record as varchar(16)) record,sum(record_count) from schema.table
group by 1)
union
(select 'Grand_Total' as record,sum(record_count) from schema.table
group by 1);

在这里查看 - SQL Fiddle

如果您的数据库支持group by ... with rollup，您也可以使用：

select ifnull(record,'Grand Total')record,sum(record_count) total_count
from schema.table
group by record asc with rollup

在这里查看 - SQL Fiddle

Answer 2

为了节省一些输入，可以使用常见的table表达式 (cte)：

with cte as
(
    select record, sum(record_count) rsum
    FROM table_name
    WHERE <conditions>
    GROUP BY record
)
select record, rsum from cte
union all
select 'Grand_Total', sum(rsum) from cte

Answer 3

您应该利用 PostgreSQL 的 windows functions。

对于这个查询，

SELECT record, record_count, sum(record_count) OVER()
    FROM (
         SELECT record, sum(record_count) record_count
           FROM table_name
           WHERE <conditions>
           GROUP BY tcpa_code
           ORDER BY sum(record_count) 
          ) as subquery

内部查询的结果集能否与最终结果集一起显示

Can the result set of inner query can be displayed with final result set

sql

postgresql

inner-query