Question

我想知道是否有人可以提供帮助。

我回来了错误：

错误代码：1054。'on clause'中的未知列'sub_claims_volume.Claims_Volume'

当我尝试运行下面的查询时。

我认为它与pi_loadings_claims_volume表的连接有关。

我已经从子查询中生成了一个表，并且在这种情况下进行连接没有问题，并且返回了正确的结果。

SELECT bdx_pi_policy_accounts.policyid,
   bdx_pi_policy_accounts.renewal,
   sub_claims_volume.claims_volume,
   pi_loadings_claims_volume.loading
FROM   bdx_pi_policy_accounts
   LEFT JOIN pi_loadings_claims_volume
   ON sub_claims_volume.claims_volume =
   pi_loadings_claims_volume.claims_per_year

LEFT JOIN (SELECT pi_claims.policyid,
    RIGHT(pi_claims.policykey, 1) AS Renewal,
    Count(pi_claims.claimid)      AS Claims_Volume
    FROM   pi_claims
    GROUP  BY pi_claims.policyid,
    pi_claims.policykey) AS sub_claims_volume
    ON bdx_pi_policy_accounts.policyid = sub_claims_volume.policyid
    AND bdx_pi_policy_accounts.renewal = sub_claims_volume.renewal

Answer 1

它显示未知列错误的原因是因为join使用pi_loadings_claims_volume表执行时，sub_claims_volume表别名未知（因为i）因此，查询可以'识别Claims_Volume列。

重新定位join中的表格（即在sub_claims_volume条件之前放置join查询）应该修复它，例如：

SELECT bdx_pi_policy_accounts.policyid,
   bdx_pi_policy_accounts.renewal,
   sub_claims_volume.claims_volume,
   pi_loadings_claims_volume.loading
FROM   bdx_pi_policy_accounts
LEFT JOIN (SELECT pi_claims.policyid,
    RIGHT(pi_claims.policykey, 1) AS Renewal,
    Count(pi_claims.claimid)      AS claims_volume
    FROM   pi_claims
    GROUP  BY pi_claims.policyid,
    pi_claims.policykey) sub_claims_volume
    ON bdx_pi_policy_accounts.policyid = sub_claims_volume.policyid
    AND bdx_pi_policy_accounts.renewal = sub_claims_volume.renewal  
LEFT JOIN pi_loadings_claims_volume
   ON sub_claims_volume.claims_volume =
   pi_loadings_claims_volume.claims_per_year

带有多个联接的“on子句”中的未知列

1 个答案: