Your code and comments are confusing. If you want to obtain comments for a known mac address, why dont you use the database to do the appropriate query: 
"select  comment 
from     arp.filter 
where    operation = 'filter' AND MAC='$mac_t'"

[download]
Also, Using fetchrow_arrayref instead of fetchrow_hashref will not make any difference to the resulting rows, as you seem to think it might.

             "By three methods we may learn wisdom: First, by reflection, which is noblest; Second, by imitation, which is easiest; and third by experience, which is the bitterest."           -Confucius

In reply to Re: MySQL hashes with same key by NetWallah
in thread MySQL hashes with same key by jcrush

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