Question

我试图进行以下更新：

UPDATE tbl_claim

INNER JOIN tbl_mbr ON tbl_mbr.MBR_NUM = tbl_mbr_cov.MBR_NUM
INNER JOIN tbl_claim ON tbl_claim.MBR_ID = tbl_mbr.MBR_ID

SET tbl_claim.Mbr_Cov_Id = tbl_mbr_cov.MBR_COV_ID

但我得到了：

[Err] 1066 - Not unique table/alias: 'tbl_claim'

然后我尝试了这个：

UPDATE tbl_claim AS A

INNER JOIN tbl_mbr AS C ON C.MBR_NUM = tbl_mbr_cov.MBR_NUM AS D
INNER JOIN tbl_claim AS B ON B.MBR_ID = C.MBR_ID

SET A.Mbr_Cov_Id = D.MBR_COV_ID

这给了我另一个错误：

[Err] 1064 - You have an error in your SQL syntax; check the manual that
corresponds to your MySQL server version for the right syntax to use near 
'as D INNER JOIN tbl_claim AS B ON B.MBR_ID = C.MBR_ID

但我不知道如何为tbl_mbr_cov指定别名？

什么是正确的解决方案？

编辑：

共有3个表格，相关字段为：

tbl_claim:
CLAIM_ID (PK)
MBR_ID
Mbr_Cov_Id

tbl_mbr:
MBR_ID (PK)
MBR_NUM

tbl_mbr_cov:
MBR_COV_ID (PK)
MBR_NUM

如上所示，链接字段名称在3个表中是相同的。我们想将tbl_claim.Mbr_Cov_Id更新为等于tbl_mbr_cov.MBR_COV_ID

中的值

这个查询工作正常，所以我知道连接是有道理的：

SELECT
tbl_claim.CLAIM_ID,
tbl_claim.MBR_ID,
tbl_claim.Mbr_Cov_Id,
tbl_mbr.MBR_ID,
tbl_mbr.MBR_NUM,
tbl_mbr_cov.MBR_COV_ID,
tbl_mbr_cov.MBR_NUM
FROM
tbl_mbr_cov
INNER JOIN tbl_mbr ON tbl_mbr.MBR_NUM = tbl_mbr_cov.MBR_NUM
INNER JOIN tbl_claim ON tbl_claim.MBR_ID = tbl_mbr.MBR_ID

在我看来，如果你可以运行这个查询，必须有一个简单的方法来更新tbl_claim.Mbr_Cov_Id字段。

Answer 1

试试这句话：

UPDATE tbl_claim

SET Mbr_Cov_Id = tbl_mbr_cov.MBR_COV_ID

FROM tbl_claim AS A
INNER JOIN tbl_mbr_cov ON A.[your_field] = tbl_mbr_cov.[your_field]
INNER JOIN tbl_mbr ON tbl_mbr.MBR_NUM = tbl_mbr_cov.MBR_NUM
INNER JOIN tbl_claim ON tbl_claim.MBR_ID = tbl_mbr.MBR_ID

WHERE [your_primary_key] = A.[your_primary_key]

更新多内连接表

1 个答案: