Hi Gurus, In oracle and sqlserver environment, after extract tables with where (FACT Table filter out unwant data) as SAS7DAT in Work folder then If i have a 8 SAS7dat, A B C D E F G H , A = E ( Fact Table , same columns and data type , only different is data) B = F (Ref table, same columns and data type , only different is data) C = G (Ref table, same columns and data type , only different is data) D = H (Ref table, same columns and data type , only different is data) Would you rather (i) A join B join C join D E join F join G join H first, then union join both dataset or (ii) A Union E, B Union F , C union G, D union H then AE Join BF join CG join DH when considering performance issue
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