distinct sql
SELECT DISTINCT column1, column2, ...
FROM table_name;
query DISTINCT
SELECT DISTINCT Column_name FROM table_name;
select distinct
SELECT DISTINCT ma_colonne
FROM nom_du_tableau
SQL server wybierz wiersze według odrębnej kolumny
SELECT a.*
FROM emails a
INNER JOIN
(SELECT email,
MIN(id) as id
FROM emails
GROUP BY email
) AS b
ON a.email = b.email
AND a.id = b.id;