COMPUTED COLUMNS Using computed columns at data load time offers a couple of key advantages. First, computed columns are virtual and exist as code that executes when the table is accessed. In effect, this does not increase your data footprint in HDFS or in the data warehouse. Second, using computed columns in this way may provide you more flexibility in changing the calculation(s) if and when business rules change. Use PROC IMSTAT to add a permanent computed column to an in-memory table:
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