LEARN complex HIVE Queries

When working with the complex hive queries which involves different analytical functions.
Here is a sample query.

       

SELECT
mag.co_magasin,
dem.id_produit                                  as id_produit_orig,
pnvente.dt_debut_commercial                     as dt_debut_commercial,
COALESCE(pnvente.id_produit,dem.id_produit)     as id_produit,
min(
CASE WHEN dem.co_validation IS NULL THEN 0 ELSE 1 END
)                                               as flg_demarque_valide,
sum(CASE WHEN dem.co_validation IS NULL THEN 0 ELSE cast(dem.mt_revient_ope AS INT) END)
           as me_dem_con_prx_cs,
0                                               as me_dem_inc_prx_cs,
0                                               as me_dem_prov_stk_cs,
sum(CASE WHEN dem.co_validation IS NULL THEN 0 ELSE cast(dem.qt_demarque AS INT) END)
           as qt_dem_con,
0                                               as qt_dem_inc,
0                                               as qt_dem_prov_stk,
RANK() OVER (PARTITION BY mag.co_magasin, dem.id_produit ORDER BY pnvente.dt_debut_commercial DESC, COALESCE(pnvente.id_produit,dem.id_produit) DESC) as rang
from default.calendrier cal
INNER JOIN default.demarque_mag_jour dem
ON  CASE WHEN dem.co_societe = 1 THEN 1 ELSE 2 END = '${hiveconf:in_co_societe}'
AND dem.dt_jour    = cal.dt_jour
LEFT OUTER JOIN default.produit_norm pn
ON  pn.co_societe = dem.co_societe
AND pn.id_produit = dem.id_produit
LEFT OUTER JOIN default.produit_norm pnvente
ON  pnvente.co_societe = pn.co_societe
AND pnvente.co_produit_rfu = pn.co_produit_lip
AND pnvente.co_type_motif='05'
INNER JOIN default.kpi_magasin mag
ON  mag.co_societe = '${hiveconf:in_co_societe}'
AND mag.id_magasin = dem.id_magasin
WHERE cal.dt_jour = '${hiveconf:in_dt_jour}'
AND NOT (dem.co_validation IS NULL AND cal.dt_jour > from_unixtime(unix_timestamp()-3*60*60*24, 'ddmmyyyy'))
-- JYP 4.4
AND dem.co_operation_magasin IN ('13','14','32')
GROUP BY
mag.co_magasin,
dem.id_produit,
pnvente.dt_debut_commercial,
COALESCE(pnvente.id_produit,dem.id_produit)