SQL子查詢的問題，「錯誤：無效引用FROM子句項...」

Question

經與SQL（目前使用PostgreSQL）麻煩

我有這個疑問，我需要比較最近項和第二最近的項目：

SELECT p1.*, p2.price_cents FROM "prices" p1 
    INNER JOIN 
    (
     SELECT price_cents, game_id from prices as p WHERE p.game_id = p1.game_id 
     ORDER BY p.created_at DESC LIMIT 1 OFFSET 1 
    ) 
    p2 ON p2.game_id = p1.game_id 

這會產生一些錯誤：

ERROR: invalid reference to FROM-clause entry for table "p1" 
LINE 1: ...AND p.game_id = p1.game_id... 
         ^
HINT: There is an entry for table "p1", but it cannot be referenced from this part of the query. 

是否有任何理由我不能從子查詢訪問P1，它是一個存在的問題，如，P1的數據ISN還沒有？有沒有另一種方法來做到這一點與JOIN？

Answer 1

根據作者的評論

如果需要從最近的第二個條目多列試試這個

SELECT p1.*, (
    SELECT price_cents 
    FROM "prices" p 
    WHERE p1.game_id = p.game_id 
    ORDER BY p.created_at DESC LIMIT 1 OFFSET 1 
) as price_cents 
FROM "prices" p1 

UPDATE，你可以嘗試

SELECT * FROM (
    SELECT p.*, (
     SELECT id 
     FROM "prices" 
     WHERE p.game_id = game_id 
     ORDER BY created_at DESC LIMIT 1 OFFSET 1 
    ) AS second_id 
    FROM "prices" p 
) p1 INNER JOIN "prices" p2 ON p1.second_id = p2.id