#!/usr/bin/perl -CSDA 

use utf8;
use Modern::Perl;
no warnings qw{uninitialized};
use Data::Dumper; 


my $tables = {  # hash ref "{", keys are day numbers
        0 => {  # day0 
                confirmed => [1, 0.334638642561918, 2, 0.8733077785172
+49, 0.8539438, 57158699],
                deaths    => [],
        }, 
        1 => {  # day1 
                confirmed => [2, 0.334538642561918, 2, 0.8733077785172
+49, 0.8539438, 57158699],
                deaths    => [],
        }, 
        2 => {
                confirmed => [3, 0.334638442561918, 2, 0.8733077785172
+49, 0.8539438, 57158699],
                deaths    => [],
        }, 
}; 

$$tables{3}{confirmed} = [3, 0.18, 2, 0.849, 0.8, 59]; 
$$tables{3}{deats} = [2, 3, 4]; 

$$tables{4} = {
        confirmed => [4, 1.3, 2, 1.9, 2, 57],
        deaths    => [],
}; 

$$tables{1}{deats}[3] = "three"; 
$$tables{1}{deats}[5] = "five"; 

$$tables{5}{alfa} = ["a", "l", "faaaaa"];

for my $d (keys %$tables) { 
        print "\nnext day... $d\n";  
        for my $t (keys %{$$tables{$d}}) { 
                print "day is $d, table is \"$t\", content: ", (join "
+, ", @{$$tables{$d}{$t}}), "\n"; 
        } 
} 

print "Dumper is: ", Dumper($tables);
[download]

result:

next day... 4
day is 4, table is "confirmed", content: 4, 1.3, 2, 1.9, 2, 57
day is 4, table is "deaths", content: 

next day... 0
day is 0, table is "confirmed", content: 1, 0.334638642561918, 2, 0.87
+3307778517249, 0.8539438, 57158699
day is 0, table is "deaths", content: 

next day... 2
day is 2, table is "confirmed", content: 3, 0.334638442561918, 2, 0.87
+3307778517249, 0.8539438, 57158699
day is 2, table is "deaths", content: 

next day... 1
day is 1, table is "deats", content: , , , three, , five
day is 1, table is "confirmed", content: 2, 0.334538642561918, 2, 0.87
+3307778517249, 0.8539438, 57158699
day is 1, table is "deaths", content: 

next day... 5
day is 5, table is "alfa", content: a, l, faaaaa

next day... 3
day is 3, table is "deats", content: 2, 3, 4
day is 3, table is "confirmed", content: 3, 0.18, 2, 0.849, 0.8, 59
Dumper is: $VAR1 = {
          '4' => {
                   'confirmed' => [
                                    4,
                                    '1.3',
                                    2,
                                    '1.9',
                                    2,
                                    57
                                  ],
                   'deaths' => []
                 },
          '0' => {
                   'confirmed' => [
                                    1,
                                    '0.334638642561918',
                                    2,
                                    '0.873307778517249',
                                    '0.8539438',
                                    57158699
                                  ],
                   'deaths' => []
                 },
          '2' => {
                   'confirmed' => [
                                    3,
                                    '0.334638442561918',
                                    2,
                                    '0.873307778517249',
                                    '0.8539438',
                                    57158699
                                  ],
                   'deaths' => []
                 },
          '1' => {
                   'deats' => [
                                undef,
                                undef,
                                undef,
                                'three',
                                undef,
                                'five'
                              ],
                   'confirmed' => [
                                    2,
                                    '0.334538642561918',
                                    2,
                                    '0.873307778517249',
                                    '0.8539438',
                                    57158699
                                  ],
                   'deaths' => []
                 },
          '5' => {
                   'alfa' => [
                               'a',
                               'l',
                               'faaaaa'
                             ]
                 },
          '3' => {
                   'deats' => [
                                2,
                                3,
                                4
                              ],
                   'confirmed' => [
                                    3,
                                    '0.18',
                                    2,
                                    '0.849',
                                    '0.8',
                                    59
                                  ]
                 }
        };
[download]