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db<>fiddle
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CREATE TABLE employee (
EmployeeID INT,
FullName VARCHAR(100) -- Column for Full Name (string)
);

INSERT INTO employee (EmployeeID, FullName) VALUES
(1, 'Stewie Griffin'),
(2, 'Peter B Griffin'),
(3, 'Lois Griffin'),
(4, 'Brian O''Connor'),
(5, 'Meg Griffin');

SELECT
SUBSTRING(FULLNAME, 1, 1)
+REPLICATE('*', CHARINDEX(' ', FULLNAME) - 2)
+SUBSTRING(FULLNAME, CHARINDEX(' ', FULLNAME), LEN(FULLNAME) - CHARINDEX(' ', FULLNAME) + 1)
FROM employee;
(No column name)
S***** Griffin
P**** B Griffin
L*** Griffin
B**** O'Connor
M** Griffin