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The schema is SYSFUN.
Returns the largest integer value less than or equal to the argument.
The argument can be of any built-in numeric type. If the argument is of type DECIMAL or REAL, it is converted to a double-precision floating-point number for processing by the function. If the argument is of type SMALLINT, INTEGER or BIGINT the argument value is returned.
The result of the function is:
The result can be null; if the argument is null, the result is the null value.