假设如果一个表中有许多值在表的列中包含空格，那么这是浪费空间。我们可以使用 TRIM() 函数从所有行中删除空格并在单个查询中更新表。按照“Employee”的示例，所有行中都有空格将展示这一概念 -
示例
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)
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从上面的结果集中我们可以看到，Employee 表的行中有很多空格。可以使用以下查询删除和更新它 -
mysql> Update Employee SET Id = TRIM(Id), Name = TRIM(Name), Address = TRIM(Address), DEPARTMENT = TRIM(Department);
Query OK, 5 rows affected (0.24 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)
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从上面的结果集中可以看到，所有的空格都被删除了，表格也被更新了。
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