在單列中更改多個值MySQL

Question

+-------+------------+-----------+-----------+ 
| ID | name  | dept_name | salary | 
+-------+------------+-----------+-----------+ 
| 10101 | Srinivasan |   0 | 71500.00 | 
| 12121 | Wu   |   0 | 90000.00 | 
| 15151 | Mozart  |   0 | 40000.00 | 
| 22222 | Einstein |   0 | 95000.00 | 
| 32343 | El Said |   0 | 60000.00 | 
| 33456 | Gold  |   0 | 87000.00 | 
| 45565 | Katz  |   0 | 82500.00 | 
| 58583 | Califieri |   0 | 62000.00 | 
| 76543 | Singh  |   0 | 80000.00 | 
| 76766 | Crick  |   0 | 72000.00 | 
| 83821 | Brandt  |   0 | 101200.00 | 
| 98345 | Kim  |   0 | 80000.00 | 
+-------+------------+-----------+-----------+ 

我想在不保存並重新創建表的情況下將dept_name列中的值更改爲值（全部不同）。有沒有辦法做到這一點？

所需的輸出：

+-------+------------+-----------+-----------+ 
| ID | name  | dept_name | salary | 
+-------+------------+-----------+-----------+ 
| 10101 | Srinivasan |   1 | 71500.00 | 
| 12121 | Wu   |   2 | 90000.00 | 
| 15151 | Mozart  |   3 | 40000.00 | 
| 22222 | Einstein |   2 | 95000.00 | 
| 32343 | El Said |   2 | 60000.00 | 
| 33456 | Gold  |   3 | 87000.00 | 
| 45565 | Katz  |   1 | 82500.00 | 
| 58583 | Califieri |   3 | 62000.00 | 
| 76543 | Singh  |   1 | 80000.00 | 
| 76766 | Crick  |   1 | 72000.00 | 
| 83821 | Brandt  |   2 | 101200.00 | 
| 98345 | Kim  |   2 | 80000.00 | 
+-------+------------+-----------+-----------+ 

Answer 1

我會建議加入上與工會的子查詢。看看我的答案在這裏舉一個例子：Reordering of column data in mysql