Oracle SQL内部连接

Question

我有以下查询，它工作正常。

SELECT c.id, c.customer_name, b.batch_prefix, b.BatchCount, b.InvoiceCount, e.time_of_delivery, e.time_of_delivery_mail, e.time_of_delivery_clock 
FROM koll_customers c 
INNER JOIN (
SELECT batch_prefix, COUNT(*) AS BatchCount, 
SUM (batch_counter) AS InvoiceCount 
FROM koll_batchlogs 
WHERE 
      exists_db = 0 
      and is_checked = 1 
     and batch_counter > 0 
     and trunc(created_date) > trunc(sysdate-7) 
GROUP BY batch_prefix) b 
ON b.batch_prefix=c.customer_prefix 
INNER JOIN koll_customer_export e 
ON c.id = e.id 

但是，当我添加另一个JOIN（最后一个加入）与SELECT和WHERE提示错误： “无效的标识符”

SELECT c.id, c.customer_name, b.batch_prefix, b.BatchCount, b.InvoiceCount 
FROM koll_customers c 
INNER JOIN (
SELECT batch_prefix, COUNT(*) AS BatchCount, 
SUM (batch_counter) AS InvoiceCount 
FROM koll_batchlogs 
WHERE 
      exists_db = 0 
      and is_checked = 1 
     and batch_counter > 0 
     and trunc(created_date) > trunc(sysdate-7) 
GROUP BY batch_prefix) b 
ON b.batch_prefix=c.customer_prefix 
INNER JOIN (
    SELECT time_of_delivery 
    FROM koll_customer_export 
    WHERE time_of_delivery=2) e 
ON e.id = c.id 

我不知道，什么是与最后一个问题加入？

Answer 1

这是join：

INNER JOIN 
(SELECT time_of_delivery 
FROM koll_customer_export 
WHERE time_of_delivery=2 
) e 
ON e.id = c.id 

你是指e.id，但你没有在子查询。试试这个：

INNER JOIN 
(SELECT time_of_delivery, id 
--------------------------^ 
FROM koll_customer_export 
WHERE time_of_delivery=2 
) e 
ON e.id = c.id 

Answer 2

INNER JOIN (
SELECT time_of_delivery 
FROM koll_customer_export 
WHERE time_of_delivery=2) e 
ON e.id = c.id 

没有名为id列。