refactor 627

Author: fishercoder1534

database/_627.sql

@@ -1,3 +1,27 @@
+--627. Swap Salary
+--
+--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    |
+
 --solution 1:
 update salary
 set sex = CHAR(ASCII('f') ^ ASCII('m') ^ ASCII(sex));