在单个 oracle 查询中获取行数和其他列值

Posted 2023-05-09

【中文标题】在单个 oracle 查询中获取行数和其他列值

【英文标题】：Fetch number of rows and other column value in single oracle query

【发布时间】：2021-10-19 14:46:58

【问题描述】：

考虑一下我有下面的表，分别称为 Book_detail 和 Author_detail：

Id	BookId	Name
1	1001	ABC
2	2001	XYZ

Price	BookId	Name
100	1001	Sham
200	2001	Ram

我想要以下结果：

countA	countB	id
1	1	2

我在下面尝试但没有工作：

Select (select count(*) from Author_Detail where BookId = 2001) as countA,
       (select count(*) as countB, Id as id from Book_Detail where BookId = 2 group by Id) 
from dual;

【参考方案1】：

使用您发布的示例数据：

SQL> with
  2  book_detail (id, bookid, name) as
  3    (select 1, 1001, 'ABC' from dual union all
  4     select 2, 2001, 'XYZ' from dual
  5    ),
  6  author_detail (price, bookid, name) as
  7    (select 100, 1001, 'Sham' from dual union all
  8     select 200, 2001, 'Ram'  from dual union all
  9     select 300, 3001, 'xxx'  from dual
 10    )
 11  select count(a.bookid) counta,
 12         count(distinct b.id) countb,
 13         b.id
 14  from book_detail b join author_detail a on a.bookid = b.bookid
 15  where a.bookid = 2001
 16  group by b.id;

    COUNTA     COUNTB         ID
---------- ---------- ----------
         1          1          2

SQL>