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Shell Programming and Scripting
Join, merge, fill NULL the void columns of multiples files like sql "LEFT JOIN" by using awk
Post 303040861 by yjacknewton on Friday 8th of November 2019 01:22:18 AM
11-08-2019
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nawk 'NR==FNR{a;next} {if($1 in a) print $1,"Found" else print}' OFS="," File_B File_A
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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.
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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
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9. Shell Programming and Scripting
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)
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10. Shell Programming and Scripting
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
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