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    <pre><code>#!/usr/bin/perl use strict ; use warnings; use DBI; use JSON::XS; use IO::File; use Data::Dumper::Names; use POSIX; my $json = JSON::XS-&gt;new-&gt;ascii-&gt;pretty-&gt;allow_nonref; my ( $dbname , $host , $port , $dbusername , $dbpasswd ) ; # Satisfy strict my $datasource = "dbi:mysql:database=$dbname;host=$host;port=$port"; #PERL DBI CONNECT my $dbh =DBI-&gt;connect($datasource, $dbusername, $dbpasswd) || die "Could not connect to database: $DBI::errstr"; #PREPARE THE QUERY my $query1=qq(select * from table); my $query_handle1 = $dbh-&gt;prepare($query1); #EXECUTE THE QUERY $query_handle1-&gt;execute(); my @Types = ("Type1","Type2","Type3"); my @Array1 = ("Record1","Record2","Record3","Record4"); # BEGIN modified data munching my %result ; my %Type_Pos ; @Type_Pos{@Types} = ( 0 .. $#Types ) ; # Map the type to position while( my $row = $query_handle1-&gt;fetchrow_hashref ) { if( ! exists $result{$row-&gt;{Array1}} ) { # Initialize Record with all possible types $result{$row-&gt;{Array1}} = [ map { 0 } @Types ] ; } $result{$row-&gt;{Array1}}-&gt;[$Type_Pos{$row-&gt;{Type}}] = $row-&gt;{Somevalue} ; } my @chart1_data = map { encode_json( { 'name' =&gt; $_, 'data'=&gt; $result{$_} } ) } sort keys %result ; # END modified data munching $dbh-&gt;disconnect(); #JSON OUTPUT my $chart1_data_json=encode_json( { chart1 =&gt; \@chart1_data } ); print $chart1_data_json; </code></pre> <p>This should do what you asked.<br> Instead of saving the data in an array I contruct a hash where the record is the key and an arrayref of Somevalue (in order of types) is the value.</p>
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    1. COthanks for your help. There are few syntax errors in the while loop. i tired to fix as below but dont see the values in the array. Can you please have a look? while( my $row = $query_handle1->fetchrow_hashref ) { if( ! exists $result{$row->{Array1} }) { # Initialize Record with all possible types $result{$row->{Array1} }= [ map { 0 } @Types ] ; } $result{$row->{Array1}->[$Type_Pos{$row->{Type}}]} = $row->{Somevalue} ; }
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    2. CO@Linus You were right, always the same mistake ... corrected now.
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    3. COappreciate your help. i am still unclear on the statement " if( ! exists $result{$row->{Array1}} )" is that meant to check if the row has anyone of the elements in Array1? and can you also explain "$result{$row->{Array1}} = [ map { 0 } @Types ]"
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