輸出VARRAY結果到1行

Question

我已經在這一段時間擱淺了一段時間。 我試圖檢索VARRAY中的值，並在另一個值下查詢它到同一行，在這種情況下，遊戲的標題，請參閱下面的更多信息。該表是目前這樣的（我已經採取了很多的屬性進行簡化它）

CREATE TYPE Publisher_Type AS OBJECT 
(PublisherName VARCHAR2(30)) 
/
CREATE TABLE Publisher_Table of Publisher_Type 
/
INSERT INTO Publisher_Table 
VALUES ('EA') 
/
CREATE OR REPLACE TYPE Genre_Game AS OBJECT 
(Genre VARCHAR(20)) 
/
CREATE OR REPLACE TYPE Genre_Type AS VARRAY(3) OF Genre_Game 
/
CREATE OR REPLACE TYPE Game_Type AS OBJECT 
(Title VARCHAR2(50), 
GamePublisher REF Publisher_Type 
GameGenre Genre_Type) 
/
CREATE Game_Table of Game_Type 
/
INSERT INTO Game_Table 
VALUES('Madden 17', (SELECT REF(c) FROM Publisher_Table WHERE 
c.PublisherName = 'EA'), (Genre_Type(Genre_Game('Sports'), 
Genre_Game('Simulation'), Genre_Game('Football'))) 

下面就是我從網上閱讀一些職位嘗試，但它只是將無法正常工作。我的理想輸出 勁爆17 EA體育，模擬，足球

SELECT title , m.GamePublisher.PublisherName, 
max(decode(rn, 1, GameGenre)) genre1, 
max(decode(rn, 2, GameGenre)) genre2, 
max(decode(rn, 3, GameGenre)) genre3 
FROM (
SELECT title, m.GamePublisher.PublisherName, f.*, 
row_number() over (partition by title order by GameGenre) rn 
FROM Game_Table m, table(m.GameGenre) f 
WHERE title = 'Madden 17' 
) 
group by title 

Answer 1

您需要使用LISTAGG（）來串聯主題值，由遊戲水平列分組。我正在使用來自this apparently related question I answered yesterday的數據。

SQL> select title 
    2   , listagg(gt.theme, ',') within group (order by gt.theme) as themes 
    3 from game_table 
    4  , table(gametheme) gt 
    5 group by title; 

TITLE    THEMES 
-------------------- ------------------------- 
Commander Cody  Fun,Puzzle 
Star Wars   Action,FPS 
Uncharted 3   Action,Puzzle 

SQL>