两个选择上的UNION给出’SQL错误：ORA-00907：缺少右括号’

我正在尝试UNION两个查询的结果.但是我收到以下错误：

Error at Command Line:9 Column:81
Error report:
SQL Error: ORA-00907: missing right parenthesis
00907. 00000 -  "missing right parenthesis"

这是我的查询：

SELECT application_id,clicks,datee,client_id FROM(
(select 
    APPL_CD AS application_id,count(*) as clicks,to_date((to_char(ACTN_TAKE_DATA_TM,'dd-mm-yyyy')),'dd-mm-yyyy') as datee,ALRT_RSPNS_FROM_CLIENT_ID AS client_id 
from  ALRT_PLATFORM_ALRT_HSTRY
    where  ACTN_TAKE_CD is not null 
    group by to_char(ACTN_TAKE_DATA_TM,'dd-mm-yyyy'),APPL_CD,ALRT_RSPNS_FROM_CLIENT_ID order by datee) 
UNION ALL
(select 
    APPL_CD AS application_id,ALRT_RSPNS_FROM_CLIENT_ID AS client_id 
from  ALRT_PLATFORM_ALRT
    where  ACTN_TAKE_CD is not null 
    group by to_char(ACTN_TAKE_DATA_TM,ALRT_RSPNS_FROM_CLIENT_ID order by datee )
)

解决方法

SELECT application_id,ALRT_RSPNS_FROM_CLIENT_ID) 
UNION ALL
(select 
    APPL_CD AS application_id,ALRT_RSPNS_FROM_CLIENT_ID )
)

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