select_item ::=
{function_name [(parameter_name [, parameter_name]...)]
| NULL
| numeric_literal
| [schema_name .] {table_name | view_name} . *
| [[schema_name .] {table_name . | view_name .}] column_name
| sequence_name . {CURRVAL | NEXTVAL}
| 'text'}
[[AS] alias]