Join and merge multiple files with duplicate key and fill void columns


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# 1  
Join and merge multiple files with duplicate key and fill void columns by using AWK

Join and merge multiple files with duplicate key and fill void columns

Hi guys,

I have many files that I want to merge:

file1.csv:

Code:
1|abc
1|def
2|ghi
2|jkl
3|mno
3|pqr


file2.csv:

Code:
1|123|jojo
1|NULL|bibi
3|789|zaza
3|012|NULL


file3.csv:

Code:
2|1a2b|1994|US
3|3c4e|1995|MG
4|5f6g|1996|FR


My desired output is like this, conserve the duplicate key and fill it with the data of anothers files, and the void columns is filling by NULL:

Code:
1|abc|123|jojo|NULL|NULL|NULL
1|def|123|jojo|NULL|NULL|NULL
1|abc|NULL|bibi|NULL|NULL|NULL
1|def|NULL|bibi|NULL|NULL|NULL
2|ghi|NULL|NULL|1a2b|1994|US
2|jkl|NULL|NULL|1a2b|1994|US
3|mno|789|zaza|3c4e|1995|MG
3|pqr|789|zaza|3c4e|1995|MG
3|mno|012|NULL|3c4e|1995|MG
3|pqr|012|NULL|3c4e|1995|MG
4|NULL|NULL|NULL|5f6g|1996|FR

How to do that with awk, join or shell scripts?

Last edited by yjacknewton; 11-06-2019 at 06:03 AM..
# 2  
Any attempts / ideas / thoughts from your side?


The fourth line of your desired output doesn't seem to be consistent.
# 3  
Quote:
Originally Posted by RudiC
Any attempts / ideas / thoughts from your side?

The fourth line of your desired output doesn't seem to be consistent.
Yes, I forgot to write "NULL"; from this column,
I have already seen many post in forum but nothing match with my desire

Last edited by yjacknewton; 11-05-2019 at 05:53 AM..
# 4  
The only algo to preserve duplicate data that I found is this:
awk 'BEGIN{FS=OFS="|"}NR==FNR{a[$1]=$0;next;}{print $0,a[$1]}' test*;

Does someone have some idea?
But result is not appropiate...
Code:
1|123|jojo|1|def
1|NULL|bibi|1|def
3|789|zaza|3|pqr
3|012|NULL|3|pqr
2|1a2b|1994|US|2|jkl
3|3c4e|1995|MG|3|pqr
4|5f6g|1996|FR|


Last edited by Scrutinizer; 11-05-2019 at 01:35 PM.. Reason: Replaced " with "
# 5  
Hi, try:
Code:
join -t \| -a 1 -a 2 -e 'NULL' -o 0 1.2 1.3 1.4 2.2 2.3 2.4 \
<(join -t \| -a 1 -a 2 -e 'NULL' -o 0 1.2 2.2 2.3 file1 file2) file3


Last edited by Scrutinizer; 11-05-2019 at 03:18 PM..
This User Gave Thanks to Scrutinizer For This Post:
# 6  
Quote:
Originally Posted by Scrutinizer
Hi, try:
Code:
join -t \| -a 1 -a 2 -e 'NULL' -o 0 1.2 1.3 1.4 2.2 2.3 2.4 \ 
\;(join -t \| -a 1 -a 2 -e 'NULL' -o 0 1.2 2.2 2.3 file1 file2) file3

I tried this code and here is the result:
Code:
1|abc|123|jojo|NULL|NULL|NULL
1|abc|NULL|bibi|NULL|NULL|NULL
1|def|123|jojo|NULL|NULL|NULL
1|def|NULL|bibi|NULL|NULL|NULL
2|ghi|NULL|NULL|1a2b|1994|US
2|jkl|NULL|NULL|1a2b|1994|US
2|sds|NULL|NULL|1a2b|1994|US
3|mno|789|zaza|3c4e|1995|MG
3|mno|012|NULL|3c4e|1995|MG
3|pqr|789|zaza|3c4e|1995|MG
3|pqr|012|NULL|3c4e|1995|MG
4|NULL|NULL|NULL|5f6g|1996|FR

Can someone give a solution by using awk?

Last edited by yjacknewton; 11-06-2019 at 06:01 AM..
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