Subtraction. The operator is also used as the unary minus for changing sign.
If both operands are integers, the result is calculated with BIGINT precision. If either integer is unsigned, the result is also an unsigned integer, unless the NO_UNSIGNED_SUBTRACTION is enabled, in which case the result is always signed.
For real or string operands, the operand with the highest precision determines the result precision.
Unary minus:
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-SELECT 96-9;
+------+
| 96-9 |
+------+
| 87 |
+------+
SELECT 15-17;
+-------+
| 15-17 |
+-------+
| -2 |
+-------+
SELECT 3.66 + 1.333;
+--------------+
| 3.66 + 1.333 |
+--------------+
| 4.993 |
+--------------+SELECT - (3+5);
+---------+
| - (3+5) |
+---------+
| -8 |
+---------+