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SQL ERROR: Bad set function before FROM clause.

...
Execution ERROR: No command found!.

$VAR1 = undef;

    my $sth = $dbh->prepare("SELECT * FROM results WHERE 1=0");
    $sth->execute;
...
      . join(', ', map { "avg($_) \n" } @cols )
      . ' FROM results';
    my $avgsHashRef = $dbh->selectrow_hashref($avgSQL);

Execution ERROR: Can't use AVG on a string! called from ./runsql3.sql 
+at 24.

...
, avg(ERWWSQLWEBProcessorTotalPCTProcessorTime)
 FROM results"] at ./runsql3.sql line 24.
$VAR1 = undef;