where am i wrong?
...
print $#{$table}; ### why cant find the length of array here

Your syntax for "highest array index" by reference is correct (as are the more common variations given by poj here), but be aware of the fact (pointed out by poj) that the highest array index is not the same as the array length (i.e., number of elements) for the default value of  $[ (see perlvar). (BTW:   Don't ever touch $[   :) 

c:\@Work\Perl\monks>perl -wMstrict -le
"my $ar = [ qw(a b c d e) ];
 ;;
 print $#{ $ar };
 print $#${ ar };
 print $#$ar;
"
4
4
4

[download]

For readability and maintainability, I tend to prefer the for-loop approach used by poj for populating a hash from an array or array reference, but here's a variation that's a bit more terse: 

c:\@Work\Perl\monks>perl -wMstrict -MData::Dump -le
"my $table = [
  ['Wellbeing Office', 'Pending'],
  ['Library','Pending'], ['Y219','InProgress'],
  ['B201','InProgress'], ['B108','InProgress'],
  ['LAB1','InProgress'], ['C303','InProgress'],
 ];
 ;;
 my %hdata =
   map @{ $_ }[0, 1],
   @$table
   ;
 ;;
 dd \%hdata;
"
{
  B108 => "InProgress",
  B201 => "InProgress",
  C303 => "InProgress",
  LAB1 => "InProgress",
  Library => "Pending",
  "Wellbeing Office" => "Pending",
  Y219 => "InProgress",
}

[download]

Give a man a fish:  <%-{-{-{-<

In reply to Re^3: how to save data to new array after retrieving from sql server by AnomalousMonk
in thread how to save data to new array after retrieving from sql server by mhoang

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.