merge help

[sas_p]

I have a dataset as follows:

	A	B	C	D	E	F	G
DAY1	1	2	3	.	.	.	.
DAY2	.	.	.	4	5	6	7
The result I want is as follows:
	A	B	C	D	E	F	G
	1	2	3	4	5	6	7

It's a very last dataset with 1300 variables

i tried to make two subset data sets with DAY1 AND DAY2 and merged then back. But the result I get is as follows:

A	B	C	D	E	F	G
1	2	3	.	.	.	.

Please help

Thanks!

[Reeza]

This is typically resolved with an UPDATE statement with your by variables. But you haven't specified your key variables. 

You can look into the update statement or provide more information if you need more help. 

[Ksharp]

proc summary data=sashelp.class;
var _numeric_;
output out=want(drop=_:) sum=;
run;