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Join, merge, fill NULL the void columns of multiples files like sql "LEFT JOIN" by using awk

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Top Forums Shell Programming and Scripting Join, merge, fill NULL the void columns of multiples files like sql "LEFT JOIN" by using awk
# 1  
Old 11-07-2019
Join, merge, fill NULL the void columns of multiples files like sql "LEFT JOIN" by using awk
Hello,

This post is already here but want to do this with another way
Merge multiples files with multiples duplicates keys by filling "NULL" the void columns for anothers joinning files

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:

result.csv
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

I already found code with JOIN but I want to do this with AWK
This is the "join" command :

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

Is there an idea with awk for more performance?
# 2  
Old 11-07-2019
What is your OS and shell?
This User Gave Thanks to Neo For This Post:
yjacknewton
# 3  
Old 11-08-2019
Quote:
Originally Posted by Neo
What is your OS and shell?
OS: Red Hat Enterprise Linux Server release 6.6 (Santiago)
Shell : /bin/sh
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