What is the Assembly of 4 or 5 tables FULL OUTER JOIN logic?

the query is as below:

as you can see, I need FULL OUTER JOIN, these 5 tables and get a column from each table that is based on three common columns (ORG_iD, CUST_ID, CURRENT_DT).

And I wonder what is the logic of the 5 FULL OUTER JOIN table?
It will return if there is a folder that exists in the single table COL1? or table, COL2 and COL3 and so on. Basically any combination of these 5 tables.

    SELECT (CASE WHEN COL1.ORG_ID IS NOT NULL THEN COL1.ORG_ID
                 WHEN COL2.ORG_ID IS NOT NULL THEN COL2.ORG_ID
                 WHEN COL3.ORG_ID IS NOT NULL THEN COL3.ORG_ID
                 WHEN COL4.ORG_ID IS NOT NULL THEN COL4.ORG_ID
                 ELSE COL5.ORG_ID 
            END) ORG_ID,
            (CASE WHEN COL1.CUST_ID IS NOT NULL THEN COL1.CUST_ID
                 WHEN COL2.CUST_ID IS NOT NULL THEN COL2.CUST_ID
                 WHEN COL3.CUST_ID IS NOT NULL THEN COL3.CUST_ID
                 WHEN COL4.CUST_ID IS NOT NULL THEN COL4.CUST_ID
                 ELSE COL5.CUST_ID
            END) CUST_ID, 
            (CASE WHEN COL1.CURRENT_DT IS NOT NULL THEN COL1.CURRENT_DT
                 WHEN COL2.CURRENT_DT IS NOT NULL THEN COL2.CURRENT_DT
                 WHEN COL3.CURRENT_DT IS NOT NULL THEN COL3.CURRENT_DT
                 WHEN COL4.CURRENT_DT IS NOT NULL THEN COL4.CURRENT_DT
                 ELSE COL5.CURRENT_DT 
            END) CURRENT_DT, 
          'VENDORS' as ITEM_NAME,
          V_AGE_IND as ACCT_AGE_IND,  
          COL1.AMT_ZSHT,  
          COL2.AMT_YFYS,  
          COL3.AMT_YFYS, 
          COL4.AMT_YFYS,  
          COL5.AMT_BZL,  
          'NAV',
          sysdate
    FROM COL1  
              FULL OUTER JOIN COL2 ON (COL1.ORG_ID=COL2.ORG_ID AND COL1.CURRENT_DT=COL2.CURRENT_DT AND COL1.CUST_ID=COL2.CUST_ID)  
              FULL OUTER JOIN COL3 ON (COL2.ORG_ID=COL3.ORG_ID AND COL2.CURRENT_DT=COL3.CURRENT_DT AND COL2.CUST_ID=COL3.CUST_ID)  
              FULL OUTER JOIN COL4 ON (COL3.ORG_ID=COL4.ORG_ID AND COL3.CURRENT_DT=COL4.CURRENT_DT AND COL3.CUST_ID=COL4.CUST_ID)  
              FULL OUTER JOIN COL5 ON (COL4.ORG_ID=COL5.ORG_ID AND COL4.CURRENT_DT=COL5.CURRENT_DT AND COL4.CUST_ID=COL5.CUST_ID)  
Any ideas?

Thank you

Hello

When you perform a JOIN EXTERNAL COMPLETE multi - build that way, whenever you add a new table, you can just join the previous table because this table could be all NULL values for a given row. You can reach each new table to the first table, either, for the same reason. You must enclose each new table with all previous tables, like this:

FULL OUTER JOIN COL2 ON  COL2.ORG_ID     =           COL1.ORG_ID
               AND COL2.CURRENT_DT =           COL1.CURRENT_DT
               AND COL2.CUST_ID    =           COL1.CUST_ID
FULL OUTER JOIN COL3 ON  COL3.ORG_ID     = COLAESCE (COL1.ORG_ID,     COL2.ORG_ID)
               AND COL3.CURRENT_DT = COALESCE (COL1.CURRENT_DT, COL2.CURRENT_DT)
               AND COL3.CUST_ID    = COALESCE (COL1.CUST_ID,    COL2.CUST_ID)
FULL OUTER JOIN COL3 ON  COL4.ORG_ID     = COLAESCE (COL1.ORG_ID,     COL2.ORG_ID,     COL3.ORG_ID)
               AND COL4.CURRENT_DT = COALESCE (COL1.CURRENT_DT, COL2.CURRENT_DT, COL3.CURRENT_DT)
               AND COL4.CUST_ID    = COALESCE (COL1.CUST_ID,    COL2.CUST_ID,    COL3.CUST_ID)
FULL OUTER JOIN COL3 ON  COL5.ORG_ID     = COLAESCE (COL1.ORG_ID,     COL2.ORG_ID,     COL3.ORG_ID,     COL4.ORG_ID)
               AND COL5.CURRENT_DT = COALESCE (COL1.CURRENT_DT, COL2.CURRENT_DT, COL3.CURRENT_DT, COL4.CURRENT_DT)
               AND COL5.CUST_ID    = COALESCE (COL1.CUST_ID,    COL2.CUST_ID,    COL3.CUST_ID,    COL4.CUST_ID)  

I hope that answers your question.
If not, post a small example data (CREATE TABLE and only relevant columns, INSERT statements), and the results you want from this data.
Explain how you get these results from these data.
Always tell what version of Oracle you are using.

Tags: Database

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