Select Code to Download

key1,key2,data1,data2,data3
A,1,A1d1,A1d2,A1d3
A,2,A2d1,A2d2,A2d3
B,1,B1d1,B1d2,B1d3

key1,key2,data4,data5
A,1,A1d4,A1d5
A,2,A2d4,A2d5
...
A,2,A2d4bis,A2d5bis
A,2,A2d4ter,A2d5ter
B,1,B1d4bis,B1d5bis

use strict;
use warnings;
use 5.012;
...
    say join '|', @row;
}
$sth->finish();

A|1|A1d1|A1d2|A1d3|A1d4|A1d5
A|2|A2d1|A2d2|A2d3|A2d4|A2d5
A|2|A2d1|A2d2|A2d3|A2d4bis|A2d5bis
A|2|A2d1|A2d2|A2d3|A2d4ter|A2d5ter
B|1|B1d1|B1d2|B1d3|B1d4|B1d5
B|1|B1d1|B1d2|B1d3|B1d4bis|B1d5bis