SQL中的多个不同列

Question

I want to select distinct combination of user age (a column name) and user name (another column name) , but when I write distinct (user_age, user_name) , there is syntax error . If anyone have ideas how to write distinct with multiple columns it will be great.

BTW, using MySQL Workbench/MySQL

thanks in advance, Lin

Answer 1

You have to leave the parenthesis. Just write

SELECT distinct user_age, user_name FROM foo where bar;

;-)

Answer 2

There are 2 ways to achieve this

SELECT DISTINCT user_age, user_name FROM table WHERE some_condition;

OR

SELECT user_age, user_name FROM table WHERE some_condition GROUP BY user_age, user_name;

Hope this helps