extraction_function 

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