Question

我有这个问题：

SELECT COUNT (DISTINCT CUSTOMER_ACCOUNT.ID) AS  NUMBER_OF_ACCOUNTS 
FROM CUSTOMER_ACCOUNT 
INNER JOIN ACCOUNT ON CUSTOMER_ACCOUNT.ACCOUNT_ID=ACCOUNT.ID 
INNER JOIN CUSTOMER_ACCOUNT ON LOAD_ACCOUNT_DETAIL_0.ID = CUSTOMER_ACCOUNT.ID
WHERE Convert(datetime, convert(char(10), [CUSTOMER_ACCOUNT].CREATED_ON, 101)) BETWEEN '2009-01-01' AND '2009-05-1'
  AND CUSTOMER_ACCOUNT.DELETED!='1' 
  AND ACCOUNT.DELETED !='1'and  LOAD_ACCOUNT_DETAIL_0.ACCOUNT_STATUS='1'

我收到此错误：

Msg 1013，Level 16，State 1，Line 1 FROM子句中的对象“CUSTOMER_ACCOUNT”和“CUSTOMER_ACCOUNT”具有相同的公开名称。使用相关名来区分它们。

不确定如何解决 - 任何想法？

Answer 1

我认为你在SQL中犯了一个错误。这一行：

INNER JOIN CUSTOMER_ACCOUNT ON LOAD_ACCOUNT_DETAIL_0.ID = CUSTOMER_ACCOUNT.ID

应该是这个吗？

INNER JOIN LOAD_ACCOUNT_DETAIL_0 ON LOAD_ACCOUNT_DETAIL_0.ID = CUSTOMER_ACCOUNT.ID

除非您的意图实际上是自我加入，否则您需要对表名进行别名（正如其他人所提到的那样）

Answer 2

您在查询中指定了两次表“CUSTOMER ACCOUNT”用作FROM以及INNER JOIN。

如果您使用CUSTOMER_ACCOUNT表的别名更改查询，那么您应该没问题。

示例：

FROM CUSTOMER_ACCOUNT AS cust_acct

INNER JOIN CUSTOMER_ACCOUNT as cust_acct_join

然后在引用列时，请务必使用您创建的别名

示例：

SELECT COUNT (DISTINCT **cust_acct.**CUSTOMER_ACCOUNT.ID) AS  NUMBER_OF_ACCOUNTS

Answer 3

你有CUSTOMER_ACCOUNT个自我加入。您需要至少为其中一个别名。

SELECT COUNT (DISTINCT CUSTOMER_ACCOUNT.ID) AS  NUMBER_OF_ACCOUNTS 
FROM CUSTOMER_ACCOUNT CA1 INNER JOIN
    ACCOUNT ON CA1.ACCOUNT_ID=ACCOUNT.ID INNER JOIN
    CUSTOMER_ACCOUNT CA2 ON LOAD_ACCOUNT_DETAIL_0.ID = CA2.CUSTOMER_ACCOUNT.ID
WHERE
Convert(datetime,convert(char(10),[CA1].CREATED_ON,101)) 
BETWEEN '2009-01-01' AND '2009-05-1'  AND  CA1.DELETED!='1' AND 
ACCOUNT.DELETED !='1'and  LOAD_ACCOUNT_DETAIL_0.ACCOUNT_STATUS='1'

Answer 4

如果你自己加入一个表，你必须使用别名：

SELECT … FROM CUSTOMER_ACCOUNT AS C1 … CUSTOMER_ACCOUNT AS C2 …

Answer 5

做类似的事情：

SELECT COUNT (DISTINCT t1.ID) AS  NUMBER_OF_ACCOUNTS 
FROM CUSTOMER_ACCOUNT t1 INNER JOIN
ACCOUNT ON t1.ACCOUNT_ID=ACCOUNT.ID INNER JOIN
CUSTOMER_ACCOUNT t2 ON LOAD_ACCOUNT_DETAIL_0.ID = t2.ID
WHERE Convert(datetime,convert(char(10),t1.CREATED_ON,101)) 
BETWEEN '2009-01-01' AND '2009-05-1'  AND  t1.DELETED!='1' AND 
ACCOUNT.DELETED !='1' and  LOAD_ACCOUNT_DETAIL_0.ACCOUNT_STATUS='1'

SQL CORRELATION

5 个答案: