Leetcode Customers Who Never Order problem solution

In this Leetcode Customers Who Never Order problem solution Suppose that a website contains two tables, the Customers table, and the Orders table. Write a SQL query to find all customers who never order anything.

Problem solution in Oracle.

select Name as "Customers"
from Customers Left Join Orders 
ON Customers.Id = Orders.CustomerId
where Orders.CustomerId is null;

Problem solution in Mysql.

SELECT A.Name As Customers
FROM Customers A
WHERE NOT EXISTS
(SELECT B.CustomerId FROM Orders B WHERE B.CustomerId = A.Id)

Problem solution in TSQL.

SELECT A.Name AS Customers
FROM Customers AS A 
LEFT JOIN Orders AS B 
ON A.Id = B.CustomerID
WHERE B.CustomerID IS NULL

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