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select ...
where  ...
OR mdf_20 LIKE '_a4bbf326102e3064a8d9e06558c4b5e2020ee353HASH(0x826998
+)'
                                                         ^^^^^^^^^^^^^
+^

select ...
where  ...
OR mdf_20 LIKE '''_a4bbf326102e3064a8d9e06558c4b5e2020ee353HASH(0x8269
+98)'''
                ^^                                         ^^^^^^^^^^^
+^^^^^

$sql = "SELECT action_id
  FROM transactions LEFT JOIN actions 
...
$sth->execute;
$aref = $sth->fetchrow_array;
print join(', ', @$aref),"\n";