查詢執行問題

Question

我有一個像

select user_id ,'abc' as user_name from t_user where user_refId=123 

查詢，我想在這裏補充一個更加條款喜歡

select user_id , 
'abc' as user_name 
select count(user) from users as user_num 
from t_user where user_refId=123 

這是行不通的。

Answer 1

select user_id, 
     'abc' as user_name, 
     (select count(user) from users) as user_num 
from t_user 
where user_refId=123 

Answer 2

請通過","分離'abc' as user_name和select count(user) from users as user_num報表，並把第二條語句括號像(select count(user) from users) as user_num。

 select user_id, 
     'abc' as user_name, 
     (select count(user) from users) as user_num 
     from t_user where user_refId=123;