Oracle選擇子查詢

請幫我解決下一個oracle sql查詢問題。Oracle選擇子查詢

SELECT "NEWS"."NEWSID" as ID, 
     "NEWS"."SLUG", 
     "NEWS_TRANSLATION".*, 
     (SELECT FILENAME FROM NEWS_MEDIA WHERE NEWSID = ID AND rownum <= 1 ORDER BY POSITION ASC) as FILENAME 
FROM "NEWS" 
INNER JOIN "NEWS_TRANSLATION" ON NEWS.NEWSID = NEWS_TRANSLATION.NEWSID 
WHERE (NEWS.PUBLISH = 1) AND (NEWS_TRANSLATION.LANG = :lang) 
ORDER BY "NEWS"."NEWSID" DESC;

當我執行此查詢我有錯誤

ORA-00907: missing right parenthesis 
00907. 00000 - "missing right parenthesis" 
*Cause:  
*Action: 
Error at Line: 4 Column: 74

來源

2012-08-03 rtyshyk

如果意圖是從news_media獲取新聞項目的MIN位置的文件名，我認爲rownum沒有被正確使用。在選擇一條記錄後應用「ORDER BY」。它需要被subqueried，或者更好的是，與MIN（position）分開連接。見http://www.oracle.com/technetwork/issue-archive/2006/06-sep/o56asktom-086197.html – Glenn 2012-08-03 13:25:10

試試這個：當您使用

「排序依據」和「 rownum「在一起，你需要先訂購它們並尋找第一個記錄。

來源

2012-08-03 17:56:51

請通過子句中的子查詢去除的順序嘗試。

來源

2012-08-03 12:19:07 TechDo

試過了，但我有同樣的錯誤。 – rtyshyk 2012-08-03 12:30:52

從FILENAME中選擇FILENAME WHERE NEWSID = ID和rownum <= 1;我不確定列名ID，請確認。 – TechDo 2012-08-03 12:57:38

這裏是工作代碼：

SELECT "NEWS"."NEWSID" as ID, 
    "NEWS"."SLUG", 
    "NEWS_TRANSLATION".*, 
    (SELECT FILENAME FROM NEWS_MEDIA WHERE NEWSID = ID AND rownum <= 1) as FILENAME 
FROM "NEWS" 
INNER JOIN "NEWS_TRANSLATION" ON NEWS.NEWSID = NEWS_TRANSLATION.NEWSID 
WHERE (NEWS.PUBLISH = 1) AND (NEWS_TRANSLATION.LANG = :lang) 
ORDER BY "NEWS"."NEWSID" DESC

來源

2012-08-03 13:08:11 Mistu4u

相同'線路錯誤：4列：51' – rtyshyk 2012-08-03 13:12:17

我在子查詢中將ID更改爲NEWS.NEWSID，所有工作都很好。但我怎麼可以用ORDER BY做到這一點？ – rtyshyk 2012-08-03 13:15:24

你想通過'order by'顯示什麼？它是否像'在你的問題中一樣？ – Mistu4u 2012-08-03 13:19:47

試試這個：

SELECT "NEWS"."NEWSID" AS ID, "NEWS"."SLUG", "NEWS_TRANSLATION".*, 
     (SELECT FILENAME 
      FROM NEWS_MEDIA 
     WHERE NEWSID = "NEWS"."NEWSID" AND ROWNUM <= 1) 
      AS FILENAME 
    FROM  "NEWS" 
     INNER JOIN 
      "NEWS_TRANSLATION" 
     ON NEWS.NEWSID = NEWS_TRANSLATION.NEWSID 
WHERE (NEWS.PUBLISH = 1) AND (NEWS_TRANSLATION.LANG = :LANG) 
ORDER BY "NEWS"."NEWSID" DESC

來源

2012-08-03 13:17:35 hmmftg

當您的子查詢僅返回主查詢中的每個記錄的一個值時，那你爲什麼要嘗試對子查詢進行排序？ – hmmftg 2012-08-03 13:19:26

我回答你的問題在這裏http://stackoverflow.com/questions/11794242/oracle-select-with-subquery#comment15674817_11796362 – rtyshyk 2012-08-03 14:23:23

@Pivasyk我的問題是：什麼是在子查詢排序的目的？ – hmmftg 2012-08-03 15:34:33

-2

SELECT STUDENT_NAME, STUDENT_ALIAS_NAME 
FROM school 
WHERE STUDENT_NAME IN (
     SELECT STUDENT_NAME 
     FROM school 
     WHERE STUDENT_DEPARMENT= 0 
     );

來源

2014-07-10 06:08:04 raja

雖然這可能會回答這個問題，但請備份代碼，並說明它爲什麼會起作用以及爲什麼它比其他答案更好。 – 2014-07-10 06:26:25

Oracle選擇子查詢

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