Another one bites the dust.

627/main.sql

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+UPDATE salary SET sex = IF (sex = 'm', 'f', 'm');

627/problem.txt

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+Given a table salary, such as the one below, that has m=male and f=female values. Swap all f and m values (i.e., change all f values to m and vice versa) with a single update statement and no intermediate temp table.
+
+Note that you must write a single update statement, DO NOT write any select statement for this problem.
+
+ 
+
+Example:
+
+| id | name | sex | salary |
+|----|------|-----|--------|
+| 1  | A    | m   | 2500   |
+| 2  | B    | f   | 1500   |
+| 3  | C    | m   | 5500   |
+| 4  | D    | f   | 500    |
+
+After running your update statement, the above salary table should have the following rows:
+
+| id | name | sex | salary |
+|----|------|-----|--------|
+| 1  | A    | f   | 2500   |
+| 2  | B    | m   | 1500   |
+| 3  | C    | f   | 5500   |
+| 4  | D    | m   | 500    |
+

627/run.sh

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+#!/bin/bash
+
+echo "Can't be botherd making this into a test"