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Query runs slow

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Hi all,

I have query like this :

select subkategori,produkid, namabarang , sum(keluar) as ttlkeluar, sum(ttlmodal) as ttlmodal from
( select subkategori, kodebarang as produkid, namabarang, keluar, tbltransaksi.modal*keluar as ttlmodal,
case
when tbltransaksi.discount<=100 then
    keluar*(harga - (discount/100*harga))
    when tbltransaksi.discount>100
        then keluar*(harga-discount)
    end as jumlah
from tblpenjualan
join tbltransaksi on tblpenjualan.id=tbltransaksi.jualid
join tblproduk on tbltransaksi.kodebarang=tblproduk.produkid
join tblsubkategori on tblproduk.subkategoriid=tblsubkategori.tblsubkategoriid
join tblkategori on tblkategori.kategoriid=tblsubkategori.kategoriid
where tblpenjualan.tanggal between '01/01/13' and '31/12/13')
as dt group by subkategori, produkid, namabarang

Sorry for the foreign language in the field name:)

This is the query to collect sales record from specific date and sum the qty based on product id.

The problem is : this query takes long time to process. It takes around 48seconds to calculate about 690 thousand record.

The explain result is :

GroupAggregate  (cost=190773.38..209827.25 rows=692868 width=65)
  Output: tblsubkategori.subkategori, tbltransaksi.kodebarang, tblproduk.namabarang, sum(tbltransaksi.keluar), sum((tbltransaksi.modal * tbltransaksi.keluar))
  ->  Sort  (cost=190773.38..192505.55 rows=692868 width=65)
        Output: tblsubkategori.subkategori, tbltransaksi.kodebarang, tblproduk.namabarang, tbltransaksi.keluar, tbltransaksi.modal
        Sort Key: tblsubkategori.subkategori, tbltransaksi.kodebarang, tblproduk.namabarang
        ->  Hash Join  (cost=5123.14..69083.49 rows=692868 width=65)
              Output: tblsubkategori.subkategori, tbltransaksi.kodebarang, tblproduk.namabarang, tbltransaksi.keluar, tbltransaksi.modal
              Hash Cond: ((tbltransaksi.kodebarang)::text = (tblproduk.produkid)::text)
              ->  Merge Join  (cost=0.77..42032.84 rows=692868 width=23)
                    Output: tbltransaksi.kodebarang, tbltransaksi.keluar, tbltransaksi.modal
                    Merge Cond: (tblpenjualan.id = tbltransaksi.jualid)
                    ->  Index Scan using tblpenjualan_pkey on public.tblpenjualan  (cost=0.29..6662.34 rows=155847 width=4)
                          Output: tblpenjualan.id, tblpenjualan.tanggal, tblpenjualan.noinvoice, tblpenjualan.customer, tblpenjualan.bayar, tblpenjualan.jenis, tblpenjualan.jumlah, tblpenjualan.keterangan, tblpenjualan.jam, tblpenjualan.kassa, tblpenjualan.jatuhtempo, tblpenjualan.cetak, tblpenjualan.modifyby, tblpenjualan.createby, tblpenjualan.sales, tblpenjualan.mesinedc, tblpenjualan.void
                          Filter: ((tblpenjualan.tanggal >= '2013-01-01'::date) AND (tblpenjualan.tanggal <= '2013-12-31'::date))
                    ->  Index Scan using tbltransaksi_idx4 on public.tbltransaksi  (cost=0.42..26320.16 rows=692890 width=27)
                          Output: tbltransaksi.id, tbltransaksi.tanggal, tbltransaksi.kodebarang, tbltransaksi.masuk, tbltransaksi.keluar, tbltransaksi.satuan, tbltransaksi.keterangan, tbltransaksi.jenis, tbltransaksi.harga, tbltransaksi.discount, tbltransaksi.jualid, tbltransaksi.beliid, tbltransaksi.mutasiid, tbltransaksi.nobukti, tbltransaksi.customerid, tbltransaksi.modal, tbltransaksi.awalid, tbltransaksi.terimabrgid, tbltransaksi.opnameid, tbltransaksi.returjualid, tbltransaksi.returbeliid
              ->  Hash  (cost=3259.85..3259.85 rows=83642 width=55)
                    Output: tblproduk.namabarang, tblproduk.produkid, tblsubkategori.subkategori
                    ->  Hash Join  (cost=5.35..3259.85 rows=83642 width=55)
                          Output: tblproduk.namabarang, tblproduk.produkid, tblsubkategori.subkategori
                          Hash Cond: ((tblproduk.subkategoriid)::text = (tblsubkategori.tblsubkategoriid)::text)
                          ->  Seq Scan on public.tblproduk  (cost=0.00..2104.42 rows=83642 width=45)
                                Output: tblproduk.produkid, tblproduk.namabarang, tblproduk.hargajual, tblproduk.subkategoriid, tblproduk.createby, tblproduk.kodepromo, tblproduk.satuan, tblproduk.foto, tblproduk.pajak, tblproduk.listingfee, tblproduk.supplierid, tblproduk.modifyby, tblproduk.qtygrosir, tblproduk.hargagrosir, tblproduk.diskonjual, tblproduk.modal
                          ->  Hash  (cost=4.23..4.23 rows=90 width=17)
                                Output: tblsubkategori.subkategori, tblsubkategori.tblsubkategoriid
                                ->  Hash Join  (cost=1.09..4.23 rows=90 width=17)
                                      Output: tblsubkategori.subkategori, tblsubkategori.tblsubkategoriid
                                      Hash Cond: ((tblsubkategori.kategoriid)::text = (tblkategori.kategoriid)::text)
                                      ->  Seq Scan on public.tblsubkategori  (cost=0.00..1.90 rows=90 width=21)
                                            Output: tblsubkategori.tblsubkategoriid, tblsubkategori.subkategori, tblsubkategori.kategoriid
                                      ->  Hash  (cost=1.04..1.04 rows=4 width=38)
                                            Output: tblkategori.kategoriid
                                            ->  Seq Scan on public.tblkategori  (cost=0.00..1.04 rows=4 width=38)
                                                  Output: tblkategori.kategoriid

Is there any way to make calculation faster ? I already index the product id field, date and some other.

Thanks for any suggestion.

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