透視列划船或創建視圖的表列名作爲值

Question

我創建一個表TVC

CREATE TABLE tvc(tvcid number(10), tvcname varchar2(15)); 

和另一個表UVC

CREATE TABLE uvc(uname varchar(10)); 

如何將數據插入到UVC表或創建視圖UVC來自tvc表的列名？

• tvcid
• tvcname

Answer 1

你可以簡單地爲這個創造，而不是建立一個單獨的表視圖：

CREATE view uvc 
AS 
SELECT tvcid as ID, 
     tvcname as Name 
FROM tvc 

Answer 2

1. 我如何將數據插入到表uvc？

   INSERT INTO uvc (uname) 
   SELECT tvc.tvcname 
   FROM tvc 
   [WHERE ..some conditions..] 
   

   注意tvc.tvcname和uvc.uname類型不匹配，所以你應該改變 uvc.uname數據類型爲varchar2(15)，以避免錯誤。

2. 如何從tvc創建視圖uvc？

   CREATE VIEW uvc AS 
   SELECT tvc.tvcname uname 
   FROM tvc 
   [WHERE ..some conditions..]; 
   

Answer 3

你可以嘗試這樣的：

with tb1 AS(
    select 1 tvcid, 'gg' tvcname from dual 
    union all 
    select 2 tvcid, 'gg2' tvcname from dual 
), tb2 as (
select 'gg' uname from dual 
union all 
select 'gg' uname from dual 
) 
SELECT DISTINCT * FROM 
TB1 LEFT JOIN TB2 ON 1 = 1