Question

我有3个数据库。

grameenphone_bill »表：tbl_admin - ＆gt; CP_ID

banglalink_bill »表：tbl_billing_response-＆gt; CPID

robi_bill »表：tbl_billing_response-＆gt; CPID

所有三个db的表都有两个常见的字段，即ChargedAmount和cpid。登录通过 grameenphone_bill »表：tbl_admin完成。

现在，我想通过使用cpid

来计算收入，即ChargedAmount

我写了一个查询但收到错误 ＃1066 - 不是唯一的表/别名：'tbl_admin'

这是我写的查询。

SELECT grameenphone_bill.tbl_admin.cp_id,
       grameenphone_bill.tbl_admin.cp_name,
       banglalink_bill.tbl_billing_response.cpid,
       robi_bill.tbl_billing_response.cpid,
       grameenphone_bill.tbl_billing_response.ChargedAmount,
       banglalink_bill.tbl_billing_response.ChargedAmount,
       robi_bill.tbl_billing_response.ChargedAmount
FROM grameenphone_bill.tbl_admin
INNER JOIN grameenphone_bill.tbl_admin ON grameenphone_bill.tbl_admin.cp_id=banglalink_bill.tbl_billing_response.cpid
INNER JOIN banglalink_bill.tbl_billing_response ON banglalink_bill.tbl_billing_response.cpid=robi_bill.tbl_billing_response.cpid

请告诉我，我哪里出错了。谢谢！

Answer 1

您join不正确 - 您不需要加入tbl_admin，它已经在您的from条款中了：

SELECT     grameenphone_bill.tbl_admin.cp_id,
           grameenphone_bill.tbl_admin.cp_name,
           banglalink_bill.tbl_billing_response.cpid,
           robi_bill.tbl_billing_response.cpid,
           grameenphone_bill.tbl_billing_response.ChargedAmount,
           banglalink_bill.tbl_billing_response.ChargedAmount,
           robi_bill.tbl_billing_response.ChargedAmount
FROM       grameenphone_bill.tbl_admin
INNER JOIN banglalink_bill.tbl_billing_response ON 
           grameenphone_bill.tbl_admin.cp_id = 
           banglalink_bill.tbl_billing_response.cpid
INNER JOIN robi_bill.tbl_billing_response ON 
           banglalink_bill.tbl_billing_response.cpid = 
           robi_bill.tbl_billing_response.cpid

Answer 2

您正在使用grameenphone_bill.tbl_admin本身加入grameenphone_bill.tbl_admin。我认为应该是robi_bill.tbl_billing_response。

SELECT grameenphone_bill.tbl_admin.cp_id,
       grameenphone_bill.tbl_admin.cp_name,
       banglalink_bill.tbl_billing_response.cpid,
       robi_bill.tbl_billing_response.cpid,
       grameenphone_bill.tbl_billing_response.ChargedAmount,
       banglalink_bill.tbl_billing_response.ChargedAmount,
       robi_bill.tbl_billing_response.ChargedAmount
FROM grameenphone_bill.tbl_admin
INNER JOIN banglalink_bill.tbl_billing_response ON grameenphone_bill.tbl_admin.cp_id=banglalink_bill.tbl_billing_response.cpid
INNER JOIN robi_bill.tbl_billing_response ON banglalink_bill.tbl_billing_response.cpid=robi_bill.tbl_billing_response.cpid

希望这有帮助。

Answer 3

当你在一个选择中选择一个表两次时，你应该给它至少一个别名：

SELECT gta.cp_id,
       gta.cp_name,
       ba.cpid,
       rb.cpid,
       gta.ChargedAmount,
       ba.ChargedAmount,
       rb.ChargedAmount
FROM grameenphone_bill.tbl_admin gta
INNER JOIN banglalink_bill.tbl_billing_response ba ON gta.cp_id=ba.cpid
INNER JOIN robi_bill.tbl_billing_response rb ON ba.cpid=rb.cpid

我希望你的问题能够解决。

MySql INNER JOIN，ERROR＃1066

3 个答案: