Oracle sql - 無效的標識符LISTAGG

Question

我是新用的LISTAGG功能。 當我運行以下腳本時，我收到一個無效的標識符錯誤：

ORA-00904：“TE”。“COUNTRY”：標識符無效

有什么想法嗎？

SELECT te.country, listagg(te.exception_date, ' ,') WITHIN GROUP (ORDER BY te.country) country
FROM 
(select unique te.exception_date, 
case when te.country is null then (select max(tt.country) from tt_transport tt where te.route = tt.route) else te.country end country
  from tt_exception te
  where trunc(te.exception_date) > '01-JAN-2015'
  and te.plant = 'Z'
  and not case when te.country is null then (select max(tt.country) from tt_transport tt where te.route = tt.route) else te.country end is null
  order by te.country) te
group by te.country
UNION ALL
SELECT te.country, listagg(te.exception_date, ' ,') WITHIN GROUP (ORDER BY te.country) country
FROM 
(select unique te.exception_date, 'GB' country
  from tt_exception te
  where trunc(te.exception_date) > '01-JAN-2015'
  and te.plant = 'W'
  and te.country is null
  order by te.country)
group by te.country

Answer 1

在查詢的第二部分中，沒有為內聯視圖定義別名。 你應該命名它，然后引用它。

SELECT te.country, listagg(te.exception_date, ' ,') WITHIN GROUP (ORDER BY te.country) country
FROM 
(select unique te.exception_date, 'GB' country
  from tt_exception te
  where trunc(te.exception_date) > '01-JAN-2015'
  and te.plant = 'W'
  and te.country is null
  order by te.country) te --missing alias
group by te.country

或者您可以在沒有別名的情況下引用列名稱。

SELECT country, listagg(exception_date, ' ,') WITHIN GROUP (ORDER BY country) country
    FROM 
    (select unique te.exception_date, 'GB' country
      from tt_exception te
      where trunc(te.exception_date) > '01-JAN-2015'
      and te.plant = 'W'
      and te.country is null
      order by te.country)
    group by country

Answer 2

SELECT te.country, listagg(te.exception_date, ' ,') WITHIN GROUP (ORDER BY te.country) country
FROM 
(select unique te.exception_date, 
case when te.country is null then (select max(tt.country) from tt_transport tt where te.route = tt.route) else te.country end country
  from tt_exception te
  where trunc(te.exception_date) > '01-JAN-2015'
  and te.plant = 'Z'
  and not case when te.country is null then (select max(tt.country) from tt_transport tt where te.route = tt.route) else te.country end is null
  order by te.country) te
group by te.country
UNION ALL
SELECT te.country, listagg(te.exception_date, ' ,') WITHIN GROUP (ORDER BY te.country) country
FROM 
(select unique te.exception_date, 'GB' country
  from tt_exception te
  where trunc(te.exception_date) > '01-JAN-2015'
  and te.plant = 'W'
  and te.country is null
  order by te.country)--**you are missing the alias "te"**
group by te.country