database [table name DATA_PES]

my @DATA_PES = ( 
     { col_name=>"rpad(reque开发者_StackOverflow社区st_no,9) as request_number",col_width=>9,col_mandatory_yn=>"n" } 

what does this mean

On tidying up, the code becomes:

my @DATA_PES = (
    {
        'col_name'         => 'rpad(request_no,9) as request_number',
        'col_width'        => 9,
        'col_mandatory_yn' => 'n',
    }
);

• @DATA_PES is an array which contains a single element.
• This single element is a hash reference.
• The hash reference contains three pairs of keys and values.

See also:

• perldoc perldata - Perl data types
• perldoc perldsc - Perl Data Structures Cookbook