2. SQL Data Types : Literals : Numeric Literals
 
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Numeric Literals
Numeric literals specify numeric values. There are three types of numeric literals:
Integer
Decimal
Floating point
A numeric literal can be assigned to any of the numeric data types or the money data type without using an explicit conversion function. The literal is automatically converted to the appropriate data type, if necessary.
By default, the period (.) is displayed to indicate the decimal point. This default can be changed by setting II_DECIMAL.
Note:  If II_DECIMAL is set to comma, you must follow any comma required in SQL syntax (such as a list of table columns or SQL functions with several parameters) by a space. For example:
SELECT col1, IFNULL(col2, 0), LEFT(col4, 22) FROM version;