Sql 分组依据以及同一查询中的总计

我有以下疑问

select role,  count(*) as cases  from ( select
     CASE WHEN r.id = 30 THEN r.name ELSE r.name || ' ' || u.member_id END AS role
    from case_inventory ci, users u, roles r
    where ci.board_id = u.board_id and
          ci.assigned_to = u.io_id and 
          u.role_id = r.id
          and ci.case_id = 40) 
    group by role;

输出为：

  Role          Cases
  President      1
  Student Member 2  

我想在同一个查询中查询总数。我该如何前进

  Role          Cases
  President      1
  Student Member 2  
  Totals         3

---

您只需在查询中添加汇总即可重新编写查询：

select nvl(role, 'Totals') role,  count(*) as cases  from ( select
     CASE WHEN r.id = 30 THEN r.name ELSE r.name || ' ' || u.member_id END AS role
    from case_inventory ci, users u, roles r
    where ci.board_id = u.board_id and
          ci.assigned_to = u.io_id and 
          u.role_id = r.id
          and ci.case_id = 40) 
    group by Rollup(role);

两件事：

• 切勿在

  FROM

  子句中使用逗号。始终使用正确、明确、标准、可读的连接语法
• 限定查询中引用多个表的所有列引用

要在Oracle中回答您的问题，请使用分组集：

select coalesce(role, 'Total') as role, count(*) as cases 
from (select (case when r.id = 30 then r.name else r.name || ' ' || u.member_id
              end_ AS role
    from case_inventory ci join
         users u
         on ci.board_id = u.board_id and
            ci.assigned_to = u.io_id join
         roles r
         on u.role_id = r.id
     where ci.case_id = 40
    ) r
group by grouping sets ( (role), () );

---

将

与ROLLUP一起使用
@穿刺者得到了它。谢谢。您的查询在Oracle中不起作用。