Added example to remove duplicated rows by columns

By Syntax/SORT Procedure/6_Remove duplicated rows by columns.sas

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+/************************************************************************************************
+ REMOVE DUPLICATED ROWS by COLUMNS
+     This program sort the input table by specified columns to ensure rows with same values in
+         these columns are adjacent. Furthermore, the sorting ensures that the first record in
+         the group has the highest value based on a column. Then, all subsequent (or duplicate)
+         rows based on specified columns are removed.
+     Keywords: PROC SORT, remove duplicates
+     SAS Versions: SAS 9, SAS Viya
+     Documentation: https://documentation.sas.com/?cdcId=pgmsascdc&cdcVersion=default&docsetId=proc&docsetTarget=p1nd17xr6wof4sn19zkmid81p926.htm
+     1. Create the WORK.CLASSTEST table and print it.
+     2. PROC SORT sorts rows by specified columns (here: Name) so that duplicated
+        rows will be sequential, and the first record in the group has the highest value for a
+        given column (here: Score).
+     3. Another PROC SORT step with the NODUPKEY option deletes rows with duplicate BY values
+        by the specified columns (here: Name), thus leaving only one row (here:the one with the
+        highest Score for each Name).
+************************************************************************************************/
+
+
+data classtest;                                                       /*1*/
+   infile datalines dsd;
+   input
+      Name :$7.
+      Subject :$7.
+      Score;
+datalines4;
+Judy,Reading,91
+Judy,Math,79
+Barbara,Math,90
+Barbara,Reading,86
+Louise,Math,72
+Louise,Reading,65
+William,Math,61
+William,Reading,71
+Henry,Math,62
+Henry,Reading,75
+Henry,Reading,84
+Jane,Math,94
+Jane,Reading,96
+;;;;
+run;
+
+proc sort data=classtest out=classtest_sort;                         /*2*/
+    by Name descending Score;
+run;
+
+proc sort data=classtest_sort out=classtest_nodup nodupkey;          /*3*/
+    by Name;
+run;

By Syntax/UNIVARIATE Procedure/1_Extreme_Observations.sas

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+/************************************************************************************************
+ PRINT EXTREME OBSERVATIONS
+     This program prints a specified amount of observations with the highest and lowest values
+     in a specified variable. It labels these observations with an identifier variable.
+     Keywords: PROC UNIVARIATE
+     SAS Versions: SAS 9, SAS Viya
+     Documentation: https://documentation.sas.com/doc/en/pgmsascdc/v_066/procstat/procstat_univariate_toc.htm
+     1. Specify the output table ODS should display from the following PROC UNIVARIATE step.
+     2. PROC UNIVARIATE prints the N (here: 3) observations from the specified input
+        (here: SASHELP.CLASS) table
+     3. Specify the variable based on which the highest and lowest observations are selected
+     (here: Height).
+     4. A specified (here: Name) variable is used to identify these observations.
+************************************************************************************************/
+
+ods select ExtremeObs;                                                /*1*/
+proc univariate data=sashelp.class nextrobs=3;                        /*2*/
+    var Height;                                                       /*3*/
+    id Name;                                                          /*4*/
+run;