我是 sql 初学者。任何人都请告诉我我的自定义查询的问题。
select *
from Follow_My_Doct.tbl_hospital_registration h
INNER JOIN Follow_My_Doct.tbl_subscribed_packages s
ON s.hospitalId = h.id
AND s.active = 1
AND ( select max(sp.expireDate), sp.hospitalId
from Follow_My_Doct.tbl_subscribed_packages sp
where sp.active = 1
group by sp.hospitalId )
where h.hospital_active = 1
<块引用>
错误代码:1241。操作数应包含 1 列
订阅表
hospital Id expireDate
145 2021-07-10
146 2021-06-10
147 2021-09-10
146 2021-10-10
答案 0 :(得分:2)
您应该将该子查询与 max 和 group by 放在 INNER JOIN 子句中。
select *
from Follow_My_Doct.tbl_hospital_registration h
INNER JOIN ( select max(sp.expireDate) maxexpiredate, sp.hospitalId
from Follow_My_Doct.tbl_subscribed_packages sp
where sp.active = 1
group by sp.hospitalId ) as s
ON s.hospitalId = h.id
where h.hospital_active = 1
由于我没有您的数据表,所以我创建了一个环境来使用表变量来测试该查询。下面的示例适用于 SQL Server,但查询适用于 MySQL,目前我的机器上还没有安装它。
declare @tbl_subscribed_packages TABLE(
hospitalId int,
active bit,
expiredate datetime
)
declare @tbl_hospital_registration table(
id int,
hospital_active bit)
现在用数据填充表格:
insert @tbl_hospital_registration
values (145,1),(146,1),(147,1)
insert @tbl_subscribed_packages
values (145,1,'2021-07-10')
,(146,1,'2021-06-10')
,(147,1,'2021-09-10')
,(146,1,'2021-10-10')
然后,我针对这些数据测试查询
select *
from @tbl_hospital_registration h
INNER JOIN ( select max(sp.expireDate) maxexpiredate, sp.hospitalId
from @tbl_subscribed_packages sp
where sp.active = 1
group by sp.hospitalId ) as s
ON s.hospitalId = h.id
where h.hospital_active = 1
请注意,在 INNER JOIN 中使用子查询作为视图,我应该为 max(expireDate) 列添加别名。 结果是:
id | hospital_active | 最大过期时间 | 医院ID |
---|---|---|---|
145 | 1 | 2021-07-10 00:00:00.000 | 145 |
146 | 1 | 2021-10-10 00:00:00.000 | 146 |
147 | 1 | 2021-09-10 00:00:00.000 | 147 |
这是你想要的吗?
答案 1 :(得分:0)
第 6 行有问题。在 AND 之后你应该有条件但你有子查询返回两个列值
答案 2 :(得分:-1)
您可以尝试以下操作 - 使用 row_number()
select * from
(
select *,row_number() over(partition by s.hospitalId order by expireDate desc ) as rn from
Follow_My_Doct.tbl_hospital_registration h INNER JOIN Follow_My_Doct.tbl_subscribed_packages s
ON s.hospitalId = h.id
where h.hospital_active = 1 and s.active = 1
)A where rn=1