从单个组的查询中获取总计

Question

我正在运行一个查询，该查询返回每个县的办公室总数。

SELECT county, COUNT(county) AS cnt
FROM state
GROUP BY county
ORDER BY county ASC

我的结果如下：

"Anderson"  "138"
"Andrews"   "17"
"Angelina"  "80"
"Aransas"   "56"
"Archer"    "38"

是否可以获取同一查询中返回的总数？

Answer 1

如果要将其作为列，请使用窗口函数：

SELECT county, COUNT(*) AS cnt,
       SUM(COUNT(*)) OVER () as total
FROM state
GROUP BY county
ORDER BY county ASC;

如果您希望将其作为附加行，请使用WITH ROLLUP：

SELECT county, COUNT(*) AS cnt
FROM state
GROUP BY county WITH ROLLUP;