All parameters to a function or procedure, unless used during parameter substitution, are passed as part of the web service request. The format in which they are passed depends on the type of the web service request.
Parameter values that are not of character or binary data types are converted to a string representation before being added to the request. This process is equivalent to casting the value to a character type. The conversion is done in accordance with the data type formatting option settings at the time the function or procedure is invoked. In particular, the conversion can be affected by such options as precision, scale, and timestamp_format.
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