Wie in Oracle PL/SQL verwenden Zugriffe auf Variablen

Question

Ich versuche, die Datumsvariablen in Oracle, schrieb ich eine einfache Aussage, aber es funktioniert nicht, kann mir jemand helfen, dieses Problem zu beheben, thx

Frank

Declare 
StartDate Date := to_date('03/11/2017', 'dd/mm/yyyy'); 
Begin 
SELECT 
    REQUESTED_DATE.CALENDAR_DATE, 
    Count(distinct FD_DW.SALES_HEADER_FACT.SALE_ID) INTO StartDate 
FROM 
    FD_DW.DATE_DIM REQUESTED_DATE, 
    FD_DW.SALES_HEADER_FACT 
WHERE 
    (REQUESTED_DATE.DATE_KEY=FD_DW.SALES_HEADER_FACT.REQUESTED_DATE_KEY ) 
    AND 
    REQUESTED_DATE.CALENDAR_DATE = StartDate 
GROUP BY 
    REQUESTED_DATE.CALENDAR_DATE; 
End; 

Fehlermeldung:

Answer 1

diese

declare 
    StartDate Date := to_date('03/11/2017', 'dd/mm/yyyy'); 
    n_count integer; 
begin 
select cnt INTO n_count from 
( 
SELECT 
    REQUESTED_DATE.CALENDAR_DATE, 
    Count(distinct HEADER_FACT.SALE_ID) as cnt 
FROM 
    FD_DW.DATE_DIM   REQUESTED_DATE, 
    FD_DW.SALES_HEADER_FACT HEADER_FACT 
WHERE 
    REQUESTED_DATE.DATE_KEY = HEADER_FACT.REQUESTED_DATE_KEY and 
    REQUESTED_DATE.CALENDAR_DATE = StartDate 
GROUP BY REQUESTED_DATE.CALENDAR_DATE 
) 
; 
end;