Did you test this?

I had to insert the missing semicolon in order to test 

$sthsql->execute( join(', ' , @row) );

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and then I got
execute failed: There are more columns in the INSERT statement than values specified in the VALUES clause. The number of values in the VALUES clause must match the number of columns specified in the INSERT statement.

What happens is that DBI spots the imbedded quotes in the joined string and cleverly escapes them.

See also Can a DBI Placeholder accept multiple values?

In reply to (Re^2: Need help with Insert) Joining bind values doesn't work by Narveson
in thread Need help with Insert by padawan_linuxero

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