Mysql“大于(>)”查询始终返回0
我正在处理一个查询,希望在其中显示即将到来的日期的数量。即使存在大于当前日期的日期,以下查询仍返回0。请帮我解决这个问题Mysql“大于(>)”查询始终返回0,mysql,date,compare,Mysql,Date,Compare,我正在处理一个查询,希望在其中显示即将到来的日期的数量。即使存在大于当前日期的日期,以下查询仍返回0。请帮我解决这个问题 SELECT (case when b.booked_date > cast(now() as date) then sum(1) else sum(0) end) as upcoming_booked_facilities from svk_apt_book_facilities b
SELECT (case when b.booked_date > cast(now() as date) then sum(1) else sum(0) end) as upcoming_booked_facilities
from svk_apt_book_facilities b
where b.customer_id = 1
and b.association_id = 1
and b.is_active = 1
group by b.facility_id
您需要求一个CASE表达式的和才能进行条件聚合:
SELECT
facility_id,
SUM(CASE WHEN booked_date > CURDATE() THEN 1 ELSE 0 END) AS upcoming_booked_facilities
FROM svk_apt_book_facilities
WHERE
customer_id = 1 AND
association_id = 1 AND
is_active = 1
GROUP BY
facility_id;
您试图使用sum作为CASE表达式的谓词,这可能不是您想要的。请注意,我还选择了facility_id,因为您是按该列进行分组的。如果您希望对整个表进行条件求和,则不要选择或按设施分组。非常感谢,它工作正常。我已按设施id分组,因为我需要有关单个设施的未来日期计数。