topic Re: How to pick alternative values form two Tables in SAS Programming

How to pick alternative values form two Tables

Naveen45 — Mon, 31 Jul 2017 17:40:47 GMT

I have 5 names in table1 and 5 names in table2..

Table1	Table2	Table
A	F	A
B	G	F
C	H	B
D	I	G
E	J	C
		H
		D
		I
		E
		J

want to create a table with output picking values alternatively from two tables

Re: How to pick alternative values form two Tables

Shmuel — Mon, 31 Jul 2017 18:51:14 GMT

Add a temporary id:

For table1 id should be: 1 3 5 ...

For table2 id should be 2 4 6 ...

then merge the two tables and drop the temporary id.

data t_table1;
  set table1;
        retain id 1;
        output;
        id+2;
run;

data t_table2;
 set table2;
       retain id 2;
       output;
       id+2;
run;

data table;
 merge t_table1 t_tabl2;
  by id;
       drop id;
run;

Re: How to pick alternative values form two Tables

novinosrin — Mon, 31 Jul 2017 19:20:55 GMT

A one to one merge?

data table1;

input var1 $;

datalines;

;

data table2;

input var2 $;

datalines;

;

data table;

set table1 ;

set table2;

var=var1;

output;

var=var2;

output;

drop var1 var2;

run;

Re: How to pick alternative values form two Tables

Naveen45 — Tue, 01 Aug 2017 06:23:58 GMT

Thank you for your reply @novinosrin .... its working....

can you explain me the logic as i dint get it

Re: How to pick alternative values form two Tables

Naveen45 — Tue, 01 Aug 2017 07:04:18 GMT

output is not comming in single coloumn

its commig in two different coloumns like this

name1	name2
A
	F
B
	G
C
	H
D
	I
E
	J

Re: How to pick alternative values form two Tables

novinosrin — Tue, 01 Aug 2017 14:21:04 GMT

That's the reason I reset the values to var instead of var1 and var2 in my example above.

var=var1;

output;

var=var2;

output;

This makes sure the output is in single column var Please run my eample, you will get it

Re: How to pick alternative values form two Tables

novinosrin — Tue, 01 Aug 2017 14:53:52 GMT

The logic: Since you mentioned two tables, I created two sample tables each containing a variable as you may have noticed var1 in table1 and var2 in table2.

Typically, the entire SAS programming revolves around the following major concepts:

1. Bring the record into PDV(memory) area where you process

2. Reset values in PDV by editing, copying or computing any values of any variables. So the new variable var takes the value of var1

3. Before resetting again, make sure to use an explicit output so that you don't miss out on the requirement to have the alternative values

4. reset the value of var again this time with value if var2

5. Use another explicit output statement to get the values written to the dataset.

Important concepts in SAS:

1. Implicit pass/output and return

2. Explicit output overriding implicit output still implicit return

3. Zipping through the dataset in memory with a loop(do until eof)

4. Zipping through by groups in memory with a loop(do until(last.by_variable)

5. Look above and Look ahead. (Lag, retain, merge with firstobs=2 and so on)

6. Look up the entire table, column for multiple values-- easy way hashes

7. Familiarise with functions however i don't emphasise this as I believe the above 6 will lead you look for functions or even create your own

Hope that helps

Re: How to pick alternative values form two Tables

Naveen45 — Tue, 01 Aug 2017 16:35:15 GMT

Thankyou for your explanation @novinosrin