Czech job vacancies with employer IČO and daily history

-- kdo teď nabírá nejvíc lidí
SELECT ico, nazev, pravni_forma, pocet_nabidek, pocet_mist
FROM volna_mista.zamestnavatele
ORDER BY pocet_mist DESC LIMIT 20;

-- medián nabízené měsíční mzdy podle profese v okrese Brno-město (3702)
SELECT v.profese_kod, v.profese, count(*) AS nabidek, sum(v.pocet_mist) AS mist,
       percentile_cont(0.5) WITHIN GROUP (ORDER BY v.mzda_od) AS median_mzda_od
FROM volna_mista.volna_mista v
JOIN volna_mista.volna_mista_okresy o USING (id)
WHERE o.okres_kod = 3702 AND v.typ_mzdy_kod = 'mesic' AND v.mzda_od >= 5000
GROUP BY 1, 2 HAVING count(*) >= 5
ORDER BY median_mzda_od DESC;

-- se sadou firmy: v jakých oborech (CZ-NACE) se nabírá v Jihomoravském kraji
SELECT f.nace_hlavni, count(DISTINCT v.ico) AS firem, sum(v.pocet_mist) AS mist
FROM volna_mista.volna_mista v
JOIN firmy.firmy f USING (ico)
WHERE v.kraj_kod = 116
GROUP BY 1 ORDER BY mist DESC LIMIT 15;