Description of retail_start_end

{
       RETAIL_YEAR_START_DATE |
	RETAIL_YEAR_END_DATE |
	RETAIL_QUARTER_START_DATE |
	RETAIL_QUARTER_END_DATE |
	RETAIL_MONTH_START_DATE |
	RETAIL_MONTH_END_DATE |
	RETAIL_WEEK_START_DATE |
	RETAIL_WEEK_END_DATE
   }( dtexpr [ , is_restated] ] )