如何将SQL查询转换为HiveSQL并获取最小日期？

Question

如何将SQL查询转换为HiveSQL并获取最小日期，而不是如下所示使用datepart：

%sql 
-- To clear table if it already exists
DROP TABLE IF EXISTS bar;

-- Create temp table syntax
CREATE TEMP VIEW  bar AS

--// Start date containing information about year and quarter
SELECT 
min(cast (datepart(year, startdate)||datepart(quarter, startdate) as bigint)) as st_dte, 
max(cast (datepart(year, enddate)||datepart (quarter, enddate) as bigint)) as end_dte, a_id, carr as bar_code, 

case when wac < 100 
then 'Dom Flg bar' 
else 'Int Flg bar' end as bar_flag, 

case when a_id in (343, 455, 123, 656, 645) 
then 1 
else 0 
end as lcc_bar 

from oair_cardecode 
GROUP BY a_id, bar_code, bar_flag, lcc_bar;

-此代码在数据块中返回错误。

Answer 1

对于Hive> = 1.3.0使用quarter(date)函数，对于Hive <1.3.0使用ceil(month(date) / 3.0)作为四分之一

select 
      min(cast(concat(year(startdate),quarter(startdate)) as bigint)) as st_dte, 
      max(cast(concat(year(enddate),quarter(enddate)) as bigint))     as end_dte, 
      a_id, 
      carr as bar_code, 
      case when wac < 100 then 'Dom Flg bar' else 'Int Flg bar' end as bar_flag, 
      case when a_id in (343, 455, 123, 656, 645) then 1 else 0 end as lcc_bar 
from oair_cardecode 
group by a_id, carr, 
      case when wac < 100 then 'Dom Flg bar' else 'Int Flg bar' end, 
      case when a_id in (343, 455, 123, 656, 645) then 1 else 0 end;

Answer 2

如何转换此值：

%sql 
-- To clear table if it already exists
DROP TABLE IF EXISTS oair_d;

-- Create temp table syntax
CREATE TEMP VIEW  oair_d AS

select *,airport_1+'-'+airport_2 as route,cast(citymarketid_1 as varchar)+cast(citymarketid_2 as varchar) as city_route 

from 
(select year, quarter, tkcarrier, nonstopmiles, OriginCityMarketID, DestCityMarketID, Origin, Dest, passengers, mktfare, itingeotype, bulkfare, mktmilesflown, #car_airlineid.car_flag, car_airlineid.airlineid, 
case when t1.citymarketnmesrt < t2.citymarketnmesrt then origin else dest end as airport_1, 
case when t1.citymarketnmesrt < t2.citymarketnmesrt then dest else origin end as airport_2, 
case when t1.citymarketnmesrt < t2.citymarketnmesrt then origincitymarketid else destcitymarketid end as citymarketid_1, 
case when t1.citymarketnmesrt < t2.citymarketnmesrt then destcitymarketid else origincitymarketid end as citymarketid_2 
from oair_db1bmarket 
LEFT OUTER JOIN aptcty  as t1 on oair_db1bmarket.originairportid=t1.airportid 
LEFT OUTER JOIN aptcty  as t2 on oair_db1bmarket.destairportid=t2.airportid 
LEFT OUTER JOIN  #car_airlineid on oair_db1bmarket.tkcarrierairlineid=#car_airlineid.airlineid 
where (Year>=2003 and Year<=2018) or (Year=2019 and Quarter in (1,2)) and OriginCountry = 'US' and DestCountry = 'US') as new_table;