Example 2.4 Selecting Unique Rows When Concatenating Tables


Select the unique rows among two or more tables based on the value of a specific column.

Example Features

Featured StepPROC SQL
Featured Step Options and StatementsUNION set operator
Related TechniqueDATA step PROC SORT, NODUPKEY option

Input Tables

Tables MARCHRUNNERS, APRILRUNNERS, and MAYRUNNERS contain the names and running times for the runners in the month that is specified in the table name.


   Obs  runner         racetime 1 Sanchez, SO 35:49.4 2 Flores, RX 38:32.8 3 Martinez, KF 36:12.3 4 Hayes, MU 35:24.7 5 Carter, RT 39:38.1 6 Rogers, LX 40:22.1 7 Clark, SQ 40:05.8 8 Taylor, TP 38:30.2 9 Smith, JD 37:03.5 10 Green, TF 37:50.0 11 Brown, GL 35:59.2 12 Lee, AO 39:36.4 ...

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