SQL (Oracle) - Wie mehrere geänderte Werte aus mehreren Tabellen abfragen

Question

Ich versuche, eine Überprüfung aller Werte, die in einem bestimmten Zeitraum aus mehreren Tabellen geändert wurden. Gibt es eine einfachere Möglichkeit, das Folgende zu schreiben?

select property_number, 'table1', count(*) 
    from table1 
    where start_date between to_date('07/01/2017','mm/dd/yyyy') and to_date('09/30/2017', 'mm/dd/yyyy') 
group by property_number 
union all 
    select property_number, 'table2', count(*) 
    from table2 
    where start_date between to_date('07/01/2017', 'mm/dd/yyyy') and to_date('09/30/2017', 'mm/dd/yyyy') 
group by property_number 
union all 
    select property_number, 'table3', count(*) 
    from table3 
    where start_date between to_date('07/01/2017', 'mm/dd/yyyy') and to_date('09/30/2017', 'mm/dd/yyyy') 
group by property_number 
union all 
    select property_number, 'table4', count(*) 
    from table4 
    where start_date between to_date('07/01/2017', 'mm/dd/yyyy') and to_date('09/30/2017', 'mm/dd/yyyy') 
group by property_number 
union all 
    select property_number, 'table5', count(*) 
    from table5 
    where start_date between to_date('07/01/2017', 'mm/dd/yyyy') and to_date('09/30/2017', 'mm/dd/yyyy') 
group by property_number 

Answer 1

Betrachten Sie ein CTE für eine DRY-er-Lösung.

WITH master_all AS 
    (SELECT property_number, 'table1' AS "indicator" 
    FROM table1 
    UNION ALL 
    SELECT property_number, 'table2' 
    FROM table2 
    UNION ALL 
    SELECT property_number, 'table3' 
    FROM table3 
    UNION ALL 
    SELECT property_number, 'table4' 
    FROM table4 
    UNION ALL 
    SELECT property_number, 'table5' 
    FROM table5) 

SELECT property_number, indicator, Count(*) AS "Audit_Count" 
FROM master_all 
WHERE start_date BETWEEN to_date('07/01/2017', 'mm/dd/yyyy') 
        AND to_date('09/30/2017', 'mm/dd/yyyy') 
GROUP BY property_number, indicator; 

Aber noch einmal, sollten Sie eine Einstellung Schema und fügen Sie alle ähnlich strukturierte Tabellen mit Anzeigefeld in einer Master-Tabelle.