Oracle無效標識符錯誤

Question

我在內部查詢的where子句中獲取了t.ev_no的oracle無效標識符錯誤

首先，讓我解釋一下我的表結構和查詢的目的。 我有一個名為vendor的表，其中包含以下列

1. ev_no
2. ev_name
3. ev_address1
4. ev_address2
5. ev_address3
6. ev_city
7. ev_state
8. ev_zip
9. 付款地址
10. ev_mwbe

我將在gridview中顯示此信息，但地址是單個列，其中包含每個單獨行上的address1，address2，address3，city，state和zip。 如果這些列中的任何一個為NULL，那么我必須跳過換行符。 因此內部查詢用case來處理這個問題。

問題是某種程度上oracle無法識別內部查詢的where子句中的t.ev_no。 我的查詢如下

select t.ev_no,
       t.ev_type,
       t.ev_name,
       (select ADD1 || ADD2 || ADD3 || CITY || STATE || ZIP
          from (select CASE
                         WHEN ev_address1 is NULL then
                          ''
                         ELSE
                          ev_address1 || '<br>'
                       END AS "ADD1",
                       CASE
                         WHEN ev_address2 is NULL then
                          ''
                         ELSE
                          ev_address2 || '<br>'
                       END AS "ADD2",
                       CASE
                         WHEN ev_address3 is NULL then
                          ''
                         ELSE
                          ev_address3 || '<br>'
                       END AS "ADD3",
                       CASE
                         WHEN ev_city is NULL then
                          ''
                         ELSE
                          ev_city || '<br>'
                       END AS "CITY",
                       CASE
                         WHEN ev_state is NULL then
                          ''
                         ELSE
                          ev_state || '<br>'
                       END AS "STATE",
                       CASE
                         WHEN ev_zip is NULL then
                          ''
                         ELSE
                          ev_zip || '<br>'
                       END AS "ZIP"
                       from vendor where ev_no = t.ev_no)) as "ADDRESS",
       t.ev_state,
       t.ev_city,
       t.payment_address,
       t.ev_mwbe
  from vendor t
 where UPPER(ev_city) like :city
 order by t.ev_state, t.ev_city, t.ev_name

請讓我知道如何糾正錯誤。

謝謝

Answer 1

不記得確切的問題，但在oracle中，嵌套查詢可以使用別名的范圍有限。 要解決此問題，您可以使用WITH子句重寫。

WITH addressquery 
     AS (SELECT ev_no, 
                CASE 
                  WHEN ev_address1 IS NULL THEN '' 
                  ELSE ev_address1 
                       || '<br>' 
                END AS "ADD1", 
                CASE 
                  WHEN ev_address2 IS NULL THEN '' 
                  ELSE ev_address2 
                       || '<br>' 
                END AS "ADD2", 
                CASE 
                  WHEN ev_address3 IS NULL THEN '' 
                  ELSE ev_address3 
                       || '<br>' 
                END AS "ADD3", 
                CASE 
                  WHEN ev_city IS NULL THEN '' 
                  ELSE ev_city 
                       || '<br>' 
                END AS "CITY", 
                CASE 
                  WHEN ev_state IS NULL THEN '' 
                  ELSE ev_state 
                       || '<br>' 
                END AS "STATE", 
                CASE 
                  WHEN ev_zip IS NULL THEN '' 
                  ELSE ev_zip 
                       || '<br>' 
                END AS "ZIP" 
         FROM   vendor) 
SELECT t.ev_no, 
       t.ev_type, 
       t.ev_name, 
       a.add1 || a.add2 || a.add3 || a.city || a.state || a.zip AS "ADDRESS", 
       t.ev_state, 
       t.ev_city, 
       t.payment_address, 
       t.ev_mwbe 
FROM   vendor t 
       join addressquery a 
         ON t.ev_no = a.ev_no 
WHERE  1 = 1 
       AND Upper(ev_city) LIKE :city 
ORDER  BY t.ev_state, 
          t.ev_city, 
          t.ev_name 

Answer 2

所以我發現查詢的嵌套導致了這個問題。 以下查詢可以成功運行，但查詢的可讀性受到重大影響。

select t.ev_no,
       t.ev_type,
       t.ev_name,
       (select CASE
                 WHEN ev_address1 is NULL then
                  ''
                 ELSE
                  ev_address1 || '<br>'
               END || CASE
                 WHEN ev_address2 is NULL then
                  ''
                 ELSE
                  ev_address2 || '<br>'
               END || CASE
                 WHEN ev_address3 is NULL then
                  ''
                 ELSE
                  ev_address3 || '<br>'
               END || CASE
                 WHEN ev_city is NULL then
                  ''
                 ELSE
                  ev_city || '<br>'
               END || CASE
                 WHEN ev_state is NULL then
                  ''
                 ELSE
                  ev_state || '<br>'
               END || CASE
                 WHEN ev_zip is NULL then
                  ''
                 ELSE
                  ev_zip || '<br>'
               END
          from LMS_APPL.tlsev_external_vendor
         where ev_no = t.ev_no) as "ADDRESS",
       t.ev_state,
       t.ev_city,
       t.payment_address,
       t.ev_mwbe
  from vendor t
 where UPPER(ev_city) like :city
 order by t.ev_state, t.ev_city, t.ev_name