# Numeric Literal
__*Floating-point approximation literal*__
+ Numeric values can be exact or approximate literal values
  + Exact value literal:
    + What is displayed in the `SQL` statement is its exact value
    + Written as an integer or decimal value, no exponent
    + Not affected by rounding errors
  + Approximated literal value:
    + Is not always used as specified in the `SQL` statement
    + Use scientific notation to write float numbers with exponents
    + Affected by rounding errors
  + For example:
```
mysql> SELECT 1.1 + 2.2 = 3.3, 1.1E0 + 2.2E0 = 3.3E0, 1.1E0 + 2.2E0;
+-----------------+-----------------------+--------------------+
| 1.1 + 2.2 = 3.3 | 1.1E0 + 2.2E0 = 3.3E0 | ~!@1.1E0 + 2.2E0@!~      |
+-----------------+-----------------------+--------------------+
|               1 |                     0 | ~!@3.3000000000000003@!~ |
+-----------------+-----------------------+--------------------+
1 row in set (0.00 sec)
```

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