You will have to do some more reading of the DBI
They say about selectall_arrayref:
This utility method combines "prepare", "execute" and "fetchall_arrayref" into a single call. It returns a reference to an array containing a reference to an array (...snip...) for each row of data fetched.
As your SQL never returns more than one row with one field, you are probably rather looking for selectrow_array
This utility method combines "prepare", "execute" and "fetchrow_array" into a single call. If called in a list context, it returns the first row of data from the statement.
So you code becomes:
my ($Count_A_ANY) = $dbh_B->selectrow_array( ... your SQL here ... );
How you link the first part of your code to the second part is a profond mystery to me, so I abstain from commenting.
A program should be light and agile, its subroutines connected like a string of pearls. The spirit and intent of the program should be retained throughout. There should be neither too little or too much, neither needless loops nor useless variables, neither lack of structure nor overwhelming rigidity." - The Tao of Programming, 4.1 - Geoffrey James
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