A Simple approach from using the basic concepts
IntuitionThe problem requires updating the sex column in the Salary table by swapping 'm' with 'f' and vice versa. Since there are only two possible values, we
# Intuition  
The problem requires updating the `sex` column in the `Salary` table by swapping 'm' with 'f' and vice versa. Since there are only two possible values, we can efficiently achieve this using the `IF` function in SQL.

# Approach  
- Use the `UPDATE` statement to modify the `sex` column in the `Salary` table.  
- The `IF` function checks if the current value of `sex` is 'm'. If true, it replaces it with 'f'; otherwise, it sets it to 'm'.  
- This ensures that all values in the column are swapped in a single query.

# Complexity  
- **Time complexity:** \(O(n)\), where \(n\) is the number of rows in the `Salary` table, since each row is updated once.  
- **Space complexity:** \(O(1)\), as the operation is performed in-place without requiring additional storage.

# Code  
```mysql
UPDATE Salary 
SET sex = IF(sex = 'm', 'f', 'm');
```
```
['Database', 'MySQL']