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This approach utilizes the SQL CASE statement within an UPDATE to switch values directly. The CASE statement allows you to perform conditional operations inside your SQL queries.
Time Complexity: O(n), where n is the number of records to update as each row is processed once.
Space Complexity: O(1), as no extra space is used apart from variables maintained by the database.
1UPDATE Salary SET sex = CASE WHEN sex = 'm' THEN 'f' ELSE 'm' END;The solution employs a SQL update command that uses the CASE statement. It checks if the sex field equals 'm' and swaps to 'f' or defaults to 'm' otherwise.
This approach uses a conditional logic that directly swaps values without additional complexity, applicable in SQL statement logic.
Time Complexity: O(n), due to examining and updating each row in the table.
Space Complexity: O(1), as it only alters existing database entries without using additional space.
1UPDATE Salary SET sex = IF(sex = 'm', 'f', 'm');This method uses an SQL IF construct to perform the conditional change. IF checks whether the sex value equals 'm' and switches to 'f', otherwise switches to 'm'.
The idea for this approach is to use a SQL CASE statement to swap values in a single column update operation. By specifying conditions, you can change 'f' to 'm' and 'm' to 'f' directly.
Time Complexity: O(n), where n is the number of rows in the table, as it requires a single pass to update all records.
Space Complexity: O(1), as no additional space is required apart from the input itself.
1UPDATE Salary SET sex = CASE WHEN sex = 'm' THEN 'f' WHEN sex = 'f'In this SQL statement, we are using a CASE clause to determine the new value for the sex column. For each row, if the current value of sex is 'm', it is changed to 'f'. If the current value is 'f', it is changed to 'm'. This ensures that all values are swapped in a single pass and without utilizing any temporary tables.