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Practical Predictive Analytics by Ralph Winters

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User exercise

After the views have been created, use SQL to read back the counts and verify the totals with the row counts produced for the original dataframes:

%sqlselect count(*) from global_temp.df_view  union allselect count(*) from global_temp.test_view union allselect count(*) from global_temp.sumdf_view union allselect count(*) from global_temp.out_sd_view

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