在MySQL中，如何從整個列的值中刪除特定前綴並更新它們？

可以透過在列上套用 TRIM() 函數以及 MySQL UPDATE 語句來完成。下面的範例會更清楚地說明這一點。

範例

假設我們有一個表格“Employee”，其前綴為“Dept.”，其中包含列“Department”的所有值如下-

mysql> Select * from Employee;
+------+----------------+------------+----------------------+
| Id   | Name           | Address    | Department           |
+------+----------------+------------+----------------------+
| 100  | Raman          | Delhi      | IT Dept.             |
| 101  | Mohan          | Haryana    | History Dept.        |
| 102  | Shyam          | Chandigarh | ENGLISH Dept.        |
| 103  | Sukhjeet Singh | Patiala    | Computer Engg. Dept. |
| 104  | Bimal Roy      | Calcutta   | Computer Engg. Dept. |
+------+----------------+------------+----------------------+
5 rows in set (0.01 sec)

現在，下面的查詢將從“Department”欄位中刪除前綴“Dept.”，並更新表格。

mysql> Update Employee set Department = TRIM(Trailing 'Dept.' FROM Department);
Query OK, 5 rows affected (0.10 sec)
Rows matched: 5 Changed: 5 Warnings: 0

mysql> Select * from Employee;
+------+----------------+------------+-----------------+
| Id   | Name           | Address    | Department      |
+------+----------------+------------+-----------------+
| 100  | Raman          | Delhi      | IT              |
| 101  | Mohan          | Haryana    | History         |
| 102  | Shyam          | Chandigarh | ENGLISH         |
| 103  | Sukhjeet Singh | Patiala    | Computer Engg.  |
| 104  | Bimal Roy      | Calcutta   | Computer Engg.  |
+------+----------------+------------+-----------------+
5 rows in set (0.00 sec)

上面的結果集顯示列值中沒有前綴「Dept.」。

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