“Supprimer C1 de TableName C1 Inner Join TableName C2 où C1.ID” Réponses codées

Supprimer C1 de TableName C1 Inner Join TableName C2 où C1.ID> C2.ID et C1.UNIQUE_FIELD = C2.Unique_field;

SELECT name, email, COUNT(name)
FROM student_contacts
GROUP BY name
HAVING COUNT(name) > 1;