在 Mssql 中加入不相关的表

Question

我的任务是重新创建从 Oracle 11g 数据库到 MSSQL 2008 数据库的视图。我被困在重新创建这个视图中：在 oracle 中是这样的：

CREATE OR REPLACE VIEW TRANSACTION_VIEW 
(FCT_TM_SOL_ID, FCT_TM_ACID, FCT_TM_RCRE_USER_ID, FCT_TM_TRAN_TYPE, 
FCT_TM_TRAN_SUB_TYPE,DA_SCHM_CODE,DC_GENDER,DC_CUST_TYPE_CODE,DA_ACCT_MGR_ID 
) 
AS 
SELECT  FCT_TM_SOL_ID,FCT_TM_ACID 
,FCT_TM_RCRE_USER_ID,FCT_TM_TRAN_TYPE,FCT_TM_TRAN_SUB_TYPE,dim_account.DA_SC 
HM_CODE, 
DC_GENDER,DC_CUST_TYPE_CODE,DA_ACCT_MGR_ID 
FROM FACT_TRANSACTION ,dim_account,dim_customer 
WHERE  FCT_TM_ACID = dim_account.DA_ACID(+) 
and dim_account.DA_CUST_ID =  dim_customer.DC_CUST_ID(+)
and dim_account.DA_ACCT_OWNERSHIP ='C';

FACT_TRANSACTION 和 dim_customer 之间没有直接关系，所以我在 MSSQL 中重新创建视图时卡住了。到目前为止我有：

CREATE  VIEW TRANSACTION_VIEW 
(FCT_TM_SOL_ID, FCT_TM_ACID, FCT_TM_RCRE_USER_ID, FCT_TM_TRAN_TYPE, 
FCT_TM_TRAN_SUB_TYPE,DA_SCHM_CODE,DC_GENDER,DC_CUST_TYPE_CODE,DA_ACCT_MGR_ID 
) 
AS 
SELECT  t1.FCT_TM_SOL_ID,t1.FCT_TM_ACID 
,t1.FCT_TM_RCRE_USER_ID,t1.FCT_TM_TRAN_TYPE,t1.FCT_TM_TRAN_SUB_TYPE,t2.DA_SCHM_CODE, 
t3.DC_GENDER,t3.DC_CUST_TYPE_CODE,t3.DA_ACCT_MGR_ID 
FROM FACT_TRANSACTION t1 
left join dim_account t2 on t1.FCT_TM_ACID = t2.DA_ACID
left join ---STUCK HERE dim_customer t3
where t2.DA_ACCT_OWNERSHIP ='C';

请帮助如何加入不相关的实体。

Answer 1

虽然 FACT_TRANSACTION 和 dim_customer 之间没有直接关系，但它们在 dim_account 中确实有共同点（尽管领域不同）。因此，您可以在 dim_account 和 dim_customer 之间进行第二个左连接：

SELECT  t1.FCT_TM_SOL_ID,t1.FCT_TM_ACID, t1.FCT_TM_RCRE_USER_ID,t1.FCT_TM_TRAN_TYPE,t1.FCT_TM_TRAN_SUB_TYPE,t2.DA_SCHM_CODE, 
t3.DC_GENDER,t3.DC_CUST_TYPE_CODE,t3.DA_ACCT_MGR_ID 
FROM FACT_TRANSACTION t1 
left join dim_account t2 on t1.FCT_TM_ACID = t2.DA_ACID
left join dim_customer t3 on t2.DA_CUST_ID = t3.DC_CUST_ID
where t2.DA_ACCT_OWNERSHIP ='C';

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