I've created a table with customer names, customer email, and their primary ID.

```
CREATE TABLE Customer 
( 
     custID NUMBER(6),
     custName VARCHAR2(30),
     custEmail VARCHAR2(50),
     PRIMARY KEY (custID) 
);

INSERT INTO customer (custID, custName, custEmail) VALUES (1, 'D.Smith', 'dsmith@yahoo.co.uk'); 
INSERT INTO customer (custID, custName, custEmail) VALUES (2, 'B.Byrne', 'bb@gmail.com'); 
INSERT INTO customer (custID, custName, custEmail) VALUES (3, 'X.Dobbs', 'xb@gmail.com');

```

How do I select the names of the customer which start with a specific uppercase letter?