sql - クエリ実行の問題

Question

私は次のようなクエリがあります

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

、ここにもう1つの句を追加したい

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

これはうまくいきません。

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

'abc' as user_nameとselect count(user) from users as user_numステートメントを区切り、 ","2 番目のステートメントを のように括弧で囲んでください(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;