如何在我的sql中添加总计作为最后一行？

Question

我正在尝试显示一行"Total",它将执行Count列的总和.以下代码将包含两列,Environment和Count.

select 
case 
when env is null THEN 'Unknown' 
else env
end,
count(*) as Count
from env_table
group by env
order by env
/

输出我想:

Windows 200

Linux 120

总计320

正如您在上面所看到的,我想要做的是在末尾添加一个名为"Total"的行,它基本上会执行SUM(count(*)).这样做的正确语法是什么？谢谢!

Answer 1

使用WITH ROLLUP修饰符GROUP BY:

SELECT   IFNULL(env, 'Unknown'),
         COUNT(*) AS Count
FROM     env_table
GROUP BY env WITH ROLLUP
ORDER BY env

Answer 2

也许是这样的吗？

SELECT   IFNULL(env, 'Unknown'),
         COUNT(*) AS Count
FROM env_table
GROUP BY env
ORDER BY env
UNION ALL
SELECT   null,
         Count(*)
FROM env_table