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Full Discussion: Join columns across multiple lines in a Text based on common column using BASH
Top Forums Shell Programming and Scripting Join columns across multiple lines in a Text based on common column using BASH Post 303014167 by RudiC on Tuesday 6th of March 2018 07:45:14 AM
Old 03-06-2018
How about (tested on linux with mawk 1.3.3)
Code:
awk -F\| '
        {TMP[$2] = TMP[$2] FA[$2] $1
         FA[$2] = FS
        }
END     {CH[1] = 97
         for (t in TMP) {n = split (TMP[t], T)
                         printf "select * from %s %c", T[1], CH[1]
                         for (i=2; i<=n; i++)   {CH[i] = CH[i-1] + 1
                                                 printf " inner join %s %c on %c.%s=%c.%s", T[i], CH[i], CH[1], t, CH[i], t
                                                }
                         printf RS
                        }
        }
' file
select * from Table1 a inner join Table2 b on a.Column1=b.Column1 inner join Table5 c on a.Column1=c.Column1
select * from Table3 a inner join Table2 b on a.Column2=b.Column2
select * from Table4 a inner join Table2 b on a.Column3=b.Column3
select * from Table2 a inner join Table5 b on a.Column4=b.Column4
select * from Table2 a

EDIT: or mayhap with a simpler END section:
Code:
END     {split ("a b c d e f g", CH, " ")
         for (t in TMP) {n = split (TMP[t], T)
                         printf "select * from %s %c", T[1], CH[1]
                         for (i=2; i<=n; i++)   printf " inner join %s %c on %c.%s=%c.%s", T[i], CH[i], CH[1], t, CH[i], t
                         printf RS
                        }

Last edited by RudiC; 03-06-2018 at 08:53 AM..
This User Gave Thanks to RudiC For This Post:
nv186000
 

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LEARN ABOUT LINUX

shtool-path

SHTOOL-PATH.TMP(1)					      GNU Portable Shell Tool						SHTOOL-PATH.TMP(1)

NAME

       shtool-path - GNU shtool command dealing with shell path variables

SYNOPSIS

       shtool path [-s|--suppress] [-r|--reverse] [-d|--dirname] [-b|--basename] [-m|--magic] [-p|--path path] str [str ...]

DESCRIPTION

       This command deals with shell $PATH variables. It can find a program through one or more filenames given by one or more str arguments.  It
       prints the absolute filesystem path to the program displayed on "stdout" plus an exit code of 0 if it was really found.

OPTIONS

       The following command line options are available.

       -s, --suppress
	   Supress output. Useful to only test whether a program exists with the help of the return code.

       -r, --reverse
	   Transform a forward path to a subdirectory into a reverse path.

       -d, --dirname
	   Output the directory name of str.

       -b, --basename
	   Output the base name of str.

       -m, --magic
	   Enable advanced magic search for ""perl"" and ""cpp"".

       -p, --path path
	   Search in path. Default is to search in $PATH.

EXAMPLE

	#   shell script
	awk=`shtool path -p "${PATH}:." gawk nawk awk`
	perl=`shtool path -m perl`
	cpp=`shtool path -m cpp`
	revpath=`shtool path -r path/to/subdir`

HISTORY

       The GNU shtool path command was originally written by Ralf S.  Engelschall <rse@engelschall.com> in 1998 for Apache. It was later taken
       over into GNU shtool.

SEE ALSO

       shtool(1), which(1).

18-Jul-2008							   shtool 2.0.8 						SHTOOL-PATH.TMP(1)
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