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$dbh->do ('INSERT into teach_info (pickup, pmonth, pday, pyear)

my $sql = "INSERT into teach_info values ($pickup,$pmonth, $pday, $pye
+ar)";

use DBI;
use strict;
...
);
my $sth = $dbh->prepare("INSERT into teach_info values(?,?,?,?)");
$sth->execute($pickup, $pmonth, $pday, $pyear);