Hello all.
I am having problems with DBI:CSV. I keep getting the following error:
"SQL ERROR: Bad table or column name 'col2 + col3' has chars not alphanumeric or underscore!
DBD::CSV::db prepare failed: SQL ERROR: Bad table or column name 'col2 + col3' has chars not alphanumeric or underscore!
for Statement "SELECT AVG(col2 + col3) FROM mydata.csv" at test_script.pl line 11."
I have the following code to query a csv file.
#!/usr/bin/perl
use DBI;
use strict;
use warnings;
## Set up connection to csv data file as a database
my $dbh = DBI->connect("dbi:CSV:f_dir=./", "", "",
{AutoCommit => 1, RaiseError => 1});
my $sth = $dbh->prepare("SELECT AVG(col2 + col3) FROM mydata.csv");
$sth->execute();
my $value = $sth->fetchrow_array;
foreach (@value){
print $_."\n";
}
$sth->finish();
$dbh->disconnect();
This works fine:
my $sth = $dbh->prepare("SELECT AVG(col3) FROM mydata.csv");
So does this:
my $sth = $dbh->prepare("SELECT (col2 + col3) FROM mydata.csv");
Just not this:
my $sth = $dbh->prepare("SELECT AVG(col2 + col3) FROM mydata.csv");
The mydata.csv file has the following in it:
col1,col2,col3,col4
575,480,192,5
388,485,194,5
379,447,210,5
504,465,215,0.8
356,439,219,0.7
481,435,225,0.6
Any idea what is going wrong? Any help would be appreciated.
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