子查詢中WHERE子句中的未知列

Question

我有我正在嘗試截斷的pages表。 我需要留下每個頁面的最後10個版本（頁面由uid標識）。

id----|----uid----|----version 

1 ----|---- 1 ----|---- 1 

2 ----|---- 1 ----|---- 2 

3 ----|---- 1 ----|---- 3 

4 ----|---- 1 ----|---- 4 

5 ----|---- 2 ----|---- 1 

6 ----|---- 2 ----|---- 2 

........... 

55 ----|---- 1 ----|---- 23 

56 ----|---- 2 ----|---- 14 

57 ----|---- 2 ----|---- 15 

我試過這個MySQL查詢：

DELETE FROM pages AS p WHERE p.id IN (
    SELECT Versions.id FROM 
     (SELECT q.id FROM pages AS q WHERE p.uid = q.uid ORDER BY q.version DESC LIMIT 10) 
    AS Versions 
) 

但上面的SQL回報：

未知列 'p.uid' 在 'where子句'

關於Stackoverflow是像我的類似問題的答案的負載，但因爲我不是SQL忍者我無法合作打破這些以適應我的問題。 我不想過度殺死我的查詢。 必須有一些簡單的答案。

我可以實現MSSQL服務器需要截斷，下面的查詢：

DELETE FROM pages WHERE id NOT IN (
    SELECT Versions.id FROM 
     (SELECT TOP (10) q.id FROM pages AS q WHERE pages.uid = q.uid ORDER BY q.version DESC) 
    AS Versions 
) 

感謝

Answer 1

你並不需要統籌查詢在這裏彙集;只需選擇ID列表，以刪除 - 該表是相同的

DELETE FROM pages WHERE id NOT IN 

    (SELECT TOP (10) id FROM pages ORDER BY q.version DESC) 

你不能「爲了通過」刪除查詢..

如果youre後的MySQL版本，和你的MySQL版本犯規子查詢的支持限制，它不支持這樣的窗函數：

delete from pages where id in 
    (select id from 
    (select id, row_number() over(order by dt desc) as rown from pages) a where a.rown > 10) 
) 

，那麼你可以考慮這樣的：

CREATE table x as SELECT * FROM pages ORDER BY q.Version DESC LIMIT 10 

TRUNCATE /*or delete from*/ pages 

INSERT INTO pages SELECT * FROM x 

Answer 2

DELETE PG FROM pages PG 
LEFT JOIN 
(
    SELECT q.id FROM pages AS q ORDER BY q.version DESC LIMIT 10 OFFSET 0 
) Versions ON Versions.ID=PG.ID 
WHERE Versions.ID IS NULL 

您可以嘗試以上查詢。

希望這會幫助你。

Answer 3

DELETE p FROM pages AS p WHERE p.id IN (
    SELECT Versions.id FROM 
     (SELECT q.id FROM pages AS q WHERE p.uid = q.uid ORDER BY q.version DESC LIMIT 10) 
    AS Versions 
) 

檢查，如果這個工程..