extraction_function

<extraction_function> ::=
  DATE        (<expression>)
| DAY         (<date_or_timestamp_expression>)
| HOUR        (<time_or_timestamp_expression>)
| MICROSECOND (<expression>)
| MINUTE      (<time_or_timestamp_expression>)
| MONTH       (<date_or_timestamp_expression>)
| SECOND      (<time_or_timestamp_expression>)
| TIME        (<expression>)
| TIMESTAMP   (<expression>[,<expression>])
| YEAR        (<date_or_timestamp_expression>)

Referenced by:

<function_spec>