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How to select records with max SQL items?
There are 2 tables in the database - users with id and name fields
and User_log with user_id and login_time fields.
We need a query that will give a selection with the user_name, last_login fields (this is the login_time of the user's last authorization). If USER_LOGINS does not contain information about user authorizations, the value should be empty.
My variant produces one entry, just with the most recent login_time, not per user.
SELECT users.id, MAX(User_log.login_time) AS user_name, last_login FROM users, user_log WHERE users.id = user_log.user_id
Please help!
UPD did!
Here is the correct answer:
SELECT users.Name AS user_name, user_logins.Login_time AS last_login
FROM users
LEFT OUTER JOIN
user_logins
ON users.ID = user_logins.User_id
WHERE
user_logins.Login_time IN
(SELECT MAX(Login_time) FROM user_logins WHERE users.ID = user_logins.User_id) OR user_logins.Login_time IS NULL; It
helped
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