$dbh2->do("INSERT INTO PerlTest (Postcode,$_,streetCount) VALUES ('',$
+_,0)");
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I think '$_' value is 'Place' and the datatype is 'varchar'.

While use a varchar values in 'values' block, the value must be in between single quote. try the below code.

$dbh2->do("INSERT INTO PerlTest (Postcode,$_,streetCount) VALUES ('','
+\$_\',0)");
[download]