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Full Discussion: Need help with Join on multiple fields
Top Forums UNIX for Dummies Questions & Answers Need help with Join on multiple fields Post 302444321 by shunter0810 on Wednesday 11th of August 2010 02:49:55 PM
Old 08-11-2010
Need help with Join on multiple fields
Hi, I need help with the join command
I have 2 files that I want to join on multiple fields.
I want to return all records from file 1
I also want empty fields in my joined file if there isn't a match in file 2

I have already sorted them so I know they are in the same order.

Code:
file1  field 3 matches to file2  field 1 
file1  field 4 matches to file2  field 2
file1  field 5 matches to file2  field 3

If I only had to match file1 field 3 to file2 field 1 this would work perfectly
Code:
join -t "|"   -a1 -j1 3 -j2 1  -o 1.3 1.4 1.5 2.1 2.2 2.3

I get output with the empty fields if no matching record exists.
Code:
1 |a|X|||
2 |a|Z|2 |a|Z

But.. I need to match on multiple fields and I have no idea how to do that.

Thanks!
Last edited by Scott; 08-11-2010 at 06:53 PM.. Reason: Please use code tags
 

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LEARN ABOUT REDHAT

join

JOIN(1) 								FSF								   JOIN(1)

NAME

       join - join lines of two files on a common field

SYNOPSIS

       join [OPTION]... FILE1 FILE2

DESCRIPTION

       For  each  pair of input lines with identical join fields, write a line to standard output.  The default join field is the first, delimited
       by whitespace.  When FILE1 or FILE2 (not both) is -, read standard input.

       -a SIDE
	      print unpairable lines coming from file SIDE

       -e EMPTY
	      replace missing input fields with EMPTY

       -i, --ignore-case ignore differences in case when comparing fields

       -j FIELD
	      (obsolescent) equivalent to `-1 FIELD -2 FIELD'

       -j1 FIELD
	      (obsolescent) equivalent to `-1 FIELD'

       -j2 FIELD
	      (obsolescent) equivalent to `-2 FIELD'

       -o FORMAT
	      obey FORMAT while constructing output line

       -t CHAR
	      use CHAR as input and output field separator

       -v SIDE
	      like -a SIDE, but suppress joined output lines

       -1 FIELD
	      join on this FIELD of file 1

       -2 FIELD
	      join on this FIELD of file 2

       --help display this help and exit

       --version
	      output version information and exit

       Unless -t CHAR is given, leading blanks separate fields and are ignored, else fields are separated by CHAR.  Any FIELD is  a  field  number
       counted from 1.	FORMAT is one or more comma or blank separated specifications, each being `SIDE.FIELD' or `0'.	Default FORMAT outputs the
       join field, the remaining fields from FILE1, the remaining fields from FILE2, all separated by CHAR.

AUTHOR

       Written by Mike Haertel.

REPORTING BUGS

       Report bugs to <bug-coreutils@gnu.org>.

COPYRIGHT

       Copyright (C) 2002 Free Software Foundation, Inc.
       This is free software; see the source for copying conditions.  There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICU-
       LAR PURPOSE.

SEE ALSO

       The  full documentation for join is maintained as a Texinfo manual.  If the info and join programs are properly installed at your site, the
       command

	      info join

       should give you access to the complete manual.

join (coreutils) 4.5.3						   February 2003							   JOIN(1)
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