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                my @a=keys(%prophash);
                my $a=join(',',@a);
...
my $temp="insert into maintable ($a) values($b)";
                $sth = $dbh->prepare ($temp);
                $sth->execute();

DBD::ODBC::db prepare failed: [Microsoft][ODBC Microsoft Access Driver
+] Syntax error in INSERT INTO statement. (SQL-42000)(DBD: st_prepare/
+SQLPrepare err=-1) at alldb.pl line 132, <DATA> line 283.