Erstellen zusätzlicher Spalte in SQL, die Anzahl der Werte halten, um bestimmte Spalten

Question

entsprechenden habe ich eine SQL-Tabelle:

id p_action0 p_action1 p_action2 
1 p_A_id1  p_B_id3 p_A_id2 
2 p_A_id1  p_C_id3 p_B_id1 
3 p_A_id1  p_A_id1 p_A_id1 
4 p_B_id1  p_B_id1 p_C_id3 
5 p_B_id1  p_B_id1 p_A_id1 

Es gibt drei Arten von Maßnahmen: p_A, p_B, p_c. Jetzt muss ich die Tabelle mit 3 zusätzlichen Spalten aktualisieren, die eine Zählung für jede ID jedes Typs gibt. Was wäre die Oracle SQl-Abfrage dafür? Der Final Table sollte so sein.

id p_action0 p_action1 p_action2 TypeA TypeB TypeC 
1 p_A_id1  p_B_id3  p_A_id2  2  1  0 
2 p_A_id1  p_C_id3  p_B_id1  1  1  1 
3 p_A_id1  p_A_id1  p_A_id1  3  0  0 
4 p_B_id1  p_B_id1  p_C_id3  0  2  1 
5 p_B_id1  p_B_id1  p_A_id1  1  2  0 

Answer 1

UPDATE MY_SQL_TABLE 
    SET TypeA = 
      (CASE WHEN p_action0 LIKE 'p_A%' THEN 1 ELSE 0 END) 
      + (CASE WHEN p_action1 LIKE 'p_A%' THEN 1 ELSE 0 END) 
      + (CASE WHEN p_action2 LIKE 'p_A%' THEN 1 ELSE 0 END), 
     TypeB = 
      (CASE WHEN p_action0 LIKE 'p_B%' THEN 1 ELSE 0 END) 
      + (CASE WHEN p_action1 LIKE 'p_B%' THEN 1 ELSE 0 END) 
      + (CASE WHEN p_action2 LIKE 'p_B%' THEN 1 ELSE 0 END), 
     TypeC = 
      (CASE WHEN p_action0 LIKE 'p_C%' THEN 1 ELSE 0 END) 
      + (CASE WHEN p_action1 LIKE 'p_C%' THEN 1 ELSE 0 END) 
      + (CASE WHEN p_action2 LIKE 'p_C%' THEN 1 ELSE 0 END); 

Als Ansicht:

CREATE OR REPLACE VIEW MY_SQL_VIEW 
AS 
    SELECT id, 
      p_action0, 
      p_action1, 
      p_action2, 
      (CASE WHEN p_action0 LIKE 'p_A%' THEN 1 ELSE 0 END) 
      + (CASE WHEN p_action1 LIKE 'p_A%' THEN 1 ELSE 0 END) 
      + (CASE WHEN p_action2 LIKE 'p_A%' THEN 1 ELSE 0 END) 
      typeA, 
      (CASE WHEN p_action0 LIKE 'p_B%' THEN 1 ELSE 0 END) 
      + (CASE WHEN p_action1 LIKE 'p_B%' THEN 1 ELSE 0 END) 
      + (CASE WHEN p_action2 LIKE 'p_B%' THEN 1 ELSE 0 END) 
      typeB, 
      (CASE WHEN p_action0 LIKE 'p_C%' THEN 1 ELSE 0 END) 
      + (CASE WHEN p_action1 LIKE 'p_C%' THEN 1 ELSE 0 END) 
      + (CASE WHEN p_action2 LIKE 'p_C%' THEN 1 ELSE 0 END) 
      typeC 
    FROM my_sql_table; 

... und dann:

SELECT * FROM MY_SQL_VIEW;