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


Login or Register for Dates, Times and to Reply

 
Thread Tools Search this Thread
# 1  
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  
What is your OS and shell?
# 3  
Quote:
Originally Posted by Neo
What is your OS and shell?
OS: Red Hat Enterprise Linux Server release 6.6 (Santiago)
Shell : /bin/sh
Login or Register for Dates, Times and to Reply

Previous Thread | Next Thread
Thread Tools Search this Thread
Search this Thread:
Advanced Search

Test Your Knowledge in Computers #554
Difficulty: Medium
Using printf() in C, %d formats a decimal variable or literal.
True or False?

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

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

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: 1|abc 1|def 2|ghi 2|jkl 3|mno 3|pqr file2.csv: (5 Replies)
Discussion started by: yjacknewton
5 Replies

2. Shell Programming and Scripting

left join using awk

Hi guys, I need AWK to merge the following 2 files: file1 1 a 1 1 2 b 2 2 3 c 3 3 4 d 4 4 file2 a a/a c/c a/c c/c a/a c/t c c/t c/c a/t g/g c/c c/t desired output: 1 a 1 1 a/a c/c a/c c/c a/a c/t 2 b 2 2 x x x x x x 3 c 3 3 c/t c/c a/t g/g c/c c/t 4 d 4 4 x x x x x x (2 Replies)
Discussion started by: g1org1o
2 Replies

3. Shell Programming and Scripting

left join using awk

Hi guys, I need to use awk to join 2 files file_1 A 001 B 002 C 003 file_2 A XX1 B XX2 output desired A 001 XX1 B 002 missing C 003 XX2 thank you! (2 Replies)
Discussion started by: g1org1o
2 Replies

4. UNIX for Dummies Questions & Answers

how to join two files using "Join" command with one common field in this problem?

file1: Toronto:12439755:1076359:July 1, 1867:6 Quebec City:7560592:1542056:July 1, 1867:5 Halifax:938134:55284:July 1, 1867:4 Fredericton:751400:72908:July 1, 1867:3 Winnipeg:1170300:647797:July 15, 1870:7 Victoria:4168123:944735:July 20, 1871:10 Charlottetown:137900:5660:July 1, 1873:2... (2 Replies)
Discussion started by: mindfreak
2 Replies

5. Web Development

Perl join two files by "common" column

Hello; I am posting to get any help on my code that I have been struggling for some time. The project is to join two files each with 80k~180k rows. I want to merge them together by the shared common column. The problem of the shared column is partially matching, not exactly the same. File1:... (5 Replies)
Discussion started by: yifangt
5 Replies

6. Shell Programming and Scripting

Remove ":" and join lines in outline file

I have a vim outliner file like this: Title title 2 :Testing now :testing 2 :testing 3 title 3 :testing :ttt :ttg Is there a way to use a script or command to remove... (7 Replies)
Discussion started by: jostber
7 Replies

7. Shell Programming and Scripting

"Join" or "Merge" more than 2 files into single output based on common key (column)

Hi All, I have working (Perl) code to combine 2 input files into a single output file using the join function that works to a point, but has the following limitations: 1. I am restrained to 2 input files only. 2. Only the "matched" fields are written out to the "matched" output file and... (1 Reply)
Discussion started by: Katabatic
1 Replies

8. UNIX for Dummies Questions & Answers

Join 2 files with multiple columns: awk/grep/join?

Hello, My apologies if this has been posted elsewhere, I have had a look at several threads but I am still confused how to use these functions. I have two files, each with 5 columns: File A: (tab-delimited) PDB CHAIN Start End Fragment 1avq A 171 176 awyfan 1avq A 172 177 wyfany 1c7k A 2 7... (3 Replies)
Discussion started by: InfoSeeker
3 Replies

9. Programming

sql,multiple join,outer join issue

example sql: select a.a1,b.b1,c.c1,d.d1,e.e1 from a left outer join b on a.x=b.x left outer join c on b.y=c.y left outer join d on d.z=a.z inner join a.t=e.t I know how single outer or inner join works in sql. But I don't really understand when there are multiple of them. can... (0 Replies)
Discussion started by: robbiezr
0 Replies

10. Shell Programming and Scripting

Left join on files using awk

nawk 'NR==FNR{a;next} {if($1 in a) print $1,"Found" else print}' OFS="," File_B File_A The above code is not working help is appreciated (6 Replies)
Discussion started by: pinnacle
6 Replies

Featured Tech Videos