Syntax
------ 
+
 
Description
----------- 
Addition.
 
If both operands are integers, the result is calculated with
BIGINT precision. If either integer is unsigned, the result
is also an unsigned integer.
 
For real or string operands, the operand with the highest
precision determines the result precision.
 
Examples
-------- 
SELECT 3+5;
 
+-----+
| 3+5 |
+-----+
| 8 |
+-----+
 


URL: https://mariadb.com/kb/en/addition-operator/