There is a series of functions that can be applied to a value (row) as an argument ( function spec) and supply a result.
<function_spec> ::= <arithmetic_function> |
<trigonometric_function>
| <string_function> | <date_function> | <time_function>
| <extraction_function> | <special_function> |
<conversion_function>
| <dbfunction_call>
arithmetic_function, trigonometric_function, string_function, date_function, time_function, extraction_function, special_function, conversion_function, dbfunction_call
The arguments and results of the functions are numeric, alphanumeric or Boolean values that are subject to certain restrictions. LONG columns are not allowed as arguments.