postgres count distinct
SELECT
COUNT(DISTINCT column)
FROM
table_name
WHERE
condition;postgres count distinct
SELECT
COUNT(DISTINCT column)
FROM
table_name
WHERE
condition;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
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