select only distinct rows postgresql code example

Example 1: postgresql left join distinct on

Select Distinct On (u.username, u.email)
     u.username
    ,u.email
    ,l.browser
    ,l.login_time
From users u
Join logins l On l.username = u.username
Order By u.username, u.email, login_time Desc
 
                                        ^

Example 2: postgres count distinct

SELECT 
   COUNT(DISTINCT column) 
FROM 
   table_name
WHERE
   condition;

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