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use dbi;
use warnings;
...
print “third script executed”;

*** code to export the final temp table to csv.

use dbi;
...
dbh->do(“insert into ttemp table”);

*** exit the database

use dbi;
use warnings;
...
dbh->do(“insert into second temp table”);

*** exit the database

use dbi;
use warnings;
...
dbh->do(“insert into third temp table where you join first and second”
+);

*** exit the database