The FLOOR numeric function returns the largest integer equivalent to a given decimal number.
FLOOR returns the largest integer value less than or equal to source_number. The parameter can be any numeric data type. The result is of the same type as the parameter unless it is NULL, in which case the result is NULL.
FLOOR(1)returns 1
FLOOR(1.2)returns 1.0
FLOOR(-1.2)returns -2.0
If possible, the scale is changed to zero. If the result cannot be represented at that scale, it is made sufficiently large to represent the number.
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