Reading the last record of a large table

[sivakarthik]

I would like to populate the last record of a variable as a new variable

Input

Sno Closing Price

1        10

2         10.5

3          10.2

4          10.4

5          10.6

Output:

Sno Closing Price   New_Closing Price

1        10                 10.6

2         10.5             10.6

3          10.2            10.6

4          10.4            10.6

5          10.6            10.6

I would like to obtain this output using both a datastep as well as a proc sql if possible.

Thank you much in advance.

[Haikuo]

Here is one way,

data have;
	input Sno Closing_Price;
	cards;
1        10
2         10.5
3          10.2
4          10.4
5          10.6
;
run;

data want;
	if _n_=1 then
			set have (rename=closing_price=new_closing keep=Closing_Price) nobs=nobs point=nobs;
			
	set have;
run;

[LinusH]

Two "why's":

1. why both SQL and data step?
2. Why do you want to add this value to all rows (the requirement...)?