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Anonymous's avatar
Anonymous
Not applicable
7 years ago
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How to join tables which does not have unique value columns or have nulls in it

i have a table with raw data and i need to  calculate some aggregations by grouping some columns and i need to join this aggregated table bak to source table to get some details. but the common columns in both tables have nulls in it and does not have a column with unique values in it. I am not able to join those becoz it says, one  of the table must have unique column values and no null values in it. How do i join in this case?

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  • BobBI's avatar
    BobBI
    7 years ago

    Hi Reddy ,

     

    You can combine 2 or more coulmns to create Composite Key .

     

    OR 

    you can copy the source table , strip out all columns except the one or tow  you think can be use as primary key ,

    U se remove duplicate  ( in query editor) and  remove duplicate from the column , Now you will have only unique value in thsi New table then use this new table  in the middle and join source table and aggregated table to this this new table

     

    source table   << New Table>>>aggregated table.

     

    If it doesn't help , share  some data to simulate the solution.

     

    thanks,

    SS

3 Replies

  • BobBI's avatar
    BobBI
    Icon for Resolver III rankResolver III
    7 years ago

    Hi Reddy ,

     

    You can combine 2 or more coulmns to create Composite Key .

     

    OR 

    you can copy the source table , strip out all columns except the one or tow  you think can be use as primary key ,

    U se remove duplicate  ( in query editor) and  remove duplicate from the column , Now you will have only unique value in thsi New table then use this new table  in the middle and join source table and aggregated table to this this new table

     

    source table   << New Table>>>aggregated table.

     

    If it doesn't help , share  some data to simulate the solution.

     

    thanks,

    SS

  • PattemManohar's avatar
    PattemManohar
    Icon for Community Champion rankCommunity Champion
    7 years ago

    Anonymous Sample data and expected output will be helpful to provide any suggestion or solution.