表重複名稱（csuser.t2）在FROM子句中內部聯接

Question

下面是被投擲錯誤的查詢：在在內部作爲重複表名（csuser.t2）FROM子句加入

SELECT t1.rxno, 
     t1.txno, 
     t2.create_datetime FROM mrgrxtxt t1,rx t2 
    INNER JOIN  (
     SELECT rxno, 
       t1. MIN(txno) AS min_txno, 
       t2. MAX(create_datetime) AS latest_txno 
     FROM mrgrxtxt t1 , rx t2 
     GROUP BY 1 
    ) t2 ON t1.rxno = t2.rxno WHERE t2.min_txno > 8 
     AND t2.create_datetime = t2.latest_txno; 

任何人可以幫忙嗎？這是informix DB。

Answer 1

您已經爲rx定義了兩個別名，t2爲子查詢定義了另一個別名。嘗試將第二個t2更改爲t3之類的其他內容。

SELECT t1.rxno, 
     t1.txno, 
     t2.create_datetime 
    FROM mrgrxtxt t1 
    JOIN rx t2 ON t1.rxno = t2.rxno 
    INNER JOIN(
     SELECT rxno, 
       t1. MIN(txno) AS min_txno, 
       t2. MAX(create_datetime) AS latest_txno 
     FROM mrgrxtxt t1 
     JOIN rx t2 ON t1.rxno = t2.rxno 
     GROUP BY 1 
    ) t3 ON t1.rxno = t3.rxno 
    WHERE t3.min_txno > 8 AND t2.create_datetime = t3.latest_txno;