MySQL SELECT 有数据时返回空集

Question

mysql> SELECT title FROM pages WHERE id=111;
+------------+
| title      |
+------------+
| 'Theology' |
+------------+
1 row in set (0.00 sec)

mysql> SELECT id FROM pages WHERE title='Theology';
Empty set (0.00 sec)

结果相互矛盾。我无法理解。

Answer 1

改变

'Theology'

到

'\'Theology\''

似乎存储的数据是“神学”而不是神学。感谢 Abhik Chakraborty。