如何使查询结果的列名大写

Question

How to make column name of query result in UPPERCASE (Postgres)

SELECT USER_NAME, USER_AGE from table; 

Result

user_name	user_age
First	123
Second	234

Expectation: Result column name to be in uppercase ( USER_NAME USER_AGE instead of user_name and user_age).

Answer 1

You can create an alias:

SELECT user_name as "USER_NAME", 
       user_age as "USER_AGE" 
from table; 

For details on how identifiers are treated see the manual