“Löschen Sie C1 aus dem TableName C1 Inner Join TableName C2, wobei c1.ID” Code-Antworten

C1 aus TableName C1 Inner JET COME TALNAME C2 WHERE C1.ID> C2.ID und C1.Unique_field = C2.Unique_field;

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