MySQL INSERT() function performs no insertion if the position of insertion is out of range. The position of insertion can be out of range in the case when we pass a negative or 0(zero) value or the value goes beyond the value of a total number of characters in an original string by 2. It can be understood with the help of the following example −
Example
The query below will perform no insertion because the position of insertion is out of range i.e. a negative value.
mysql> Select INSERT('Virat', -1,5,'Kohli');
+-------------------------------+
| INSERT('Virat', -1,5,'Kohli') |
+-------------------------------+
| Virat |
+-------------------------------+
1 row in set (0.00 sec)下面的查询不会执行插入操作，因为插入位置超出范围，即0（零）。
mysql> Select INSERT('Virat', 0,5,'Kohli');
+------------------------------+
| INSERT('Virat', 0,5,'Kohli') |
+------------------------------+
| Virat |
+------------------------------+
1 row in set (0.00 sec)下面的查询不会执行插入操作，因为插入位置超出范围，即超过原始字符串中字符数量的值2。在下面的示例中，原始字符串'Virat'有5个字符，我们给出的位置值是7，因此不会发生插入。
mysql> Select INSERT('Virat', 7,5,'Kohli');
+------------------------------+
| INSERT('Virat', 7,5,'Kohli') |
+------------------------------+
| Virat |
+------------------------------+
1 row in set (0.00 sec) 
