1. To add a new tuple to the employee table, you can use the INSERT INTO command. Here's an example:

```sql
INSERT INTO employee (ID, Name, Email, Department, Salary)
VALUES (6, 'New Employee', 'newemployee@gmail.com', 'New Department', 70000);
```

2. To change John Doe's department from Software Engineering to Information Systems, you can use the UPDATE command:

```sql
UPDATE employee
SET Department = 'Information Systems'
WHERE Name = 'John Doe';
```

3. To return all the salaries that are being paid without any duplicates, you can use the SELECT DISTINCT command:

```sql
SELECT DISTINCT Salary
FROM employee;
```

4. To remove the email column from the employee table, you can use the ALTER TABLE command:

```sql
ALTER TABLE employee
DROP COLUMN Email;
```

5. To display all the records that have the second character of the department as an 'O', you can use the LIKE command:

```sql
SELECT *
FROM employee
WHERE Department LIKE '_O%';
```

6. To find the person who earns the most money, you can use the MAX function:

```sql
SELECT Name, MAX(Salary)
FROM employee;
```

Question

1. To add a new tuple to the employee table, you can use the INSERT INTO command. Here's an example:

```sql
INSERT INTO employee (ID, Name, Email, Department, Salary)
VALUES (6, 'New Employee', 'newemployee@gmail.com', 'New Department', 70000);
```

2. To change John Doe's department from Software Engineering to Information Systems, you can use the UPDATE command:

```sql
UPDATE employee
SET Department = 'Information Systems'
WHERE Name = 'John Doe';
```

3. To return all the salaries that are being paid without any duplicates, you can use the SELECT DISTINCT command:

```sql
SELECT DISTINCT Salary
FROM employee;
```

4. To remove the email column from the employee table, you can use the ALTER TABLE command:

```sql
ALTER TABLE employee
DROP COLUMN Email;
```

5. To display all the records that have the second character of the department as an 'O', you can use the LIKE command:

```sql
SELECT *
FROM employee
WHERE Department LIKE '_O%';
```

6. To find the person who earns the most money, you can use the MAX function:

```sql
SELECT Name, MAX(Salary)
FROM employee;
```

Knowee AI · Accepted Answer