Table: Salary
+-------------+----------+
| Column Name | Type |
+-------------+----------+
| id | int |
| name | varchar |
| sex | ENUM |
| salary | int |
+-------------+----------+
id is the primary key for this table.
The sex column is ENUM value of type (‘m’, ‘f’).
The table contains information about an employee.
Write an SQL query to 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 temporary tables.
Note that you must write a single update statement, do not write any select statement for this problem.
Solution
这里使用 /(SET/)，具体用法见代码
点击查看代码
UPDATE Salary
SET sex=
(case
WHEN sex='f' THEN 'm'
ELSE 'f'
end)
原创文章，作者：ItWorker，如若转载，请注明出处：https://blog.ytso.com/tech/database/289147.html