Hi,
I didnt get the meaning of this.
try with the full Bkey if no results try with the partial key Bfield2, Bfield3, if still no results go with Bfield1.
What I have understood from your requirement is you simply want to join key fields of table A and B and wants to get the output as shown above.
But still I haven't got your requirement clearly.
Please elaborate more.
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Sumeet