是否可以从两个未连接的表中提取计数?
例如:
SELECT
(SELECT COUNT(PERSON) FROM PEOPLE),
COUNT(BUILDINGS)
FROM
BUILDINGS
我收到错误说:
不是单组小组的功能。
答案 0 :(得分:0)
一种方法是在select
子句中移动两个计数查询:
select
(SELECT COUNT(*) FROM PEOPLE) people_cnt,
(SELECT COUNT(*) FROM BUILDINGS) building_cnt
from dual