Answer Posted / kithsiri

Data C;
Set A B;
run;
Concaternate A and B data sets and make c Data set. Then data of B data set is placed after data of A data set. If A has n1 number of observation and B set has n2 number of observation. Then C(new set has n1+n2 number of data)
Data C;
set A B;
By var1;
run;
If var1 variable is exist in both A and B data sets, in C data set rows are arrenged according to var1 variable(ascending order).
Data C;
merge A B;
By var1;
run;
Data are arrenged side by side if there are var1 in both data sets and match rows of both sets. If A data set is not matched with B then display records of A in left side and right side data is missing values. If B data is not matched with A then display records of B in right side and left side data is missing values. If there is same variable in both tables, observation of that variable of first table is replaced by observation of the same variable of second table when match observation of var1 in both tables.

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