如何从时间戳中分离日期和时间并将其存储在Hive的另一个表中

Question

I have installed hive 2.1.1 on hadoop where I have created table with name data with columns (dis string,dt timestamp). I wanted to store date and time in separate columns so i created another table with name data1 and columns (dis string, dat date,time string). How can i copy data from table data to data1. I have tried to it by doing "insert into table data1 select dis,convert(date,dt),convert(time,dt) from data;".

Answer 1

使用以下查询

insert into table data1 select dis,TO_DATE(dt),concat(HOUR(DT),':',MINUTE(dt)) from data;

Answer 2

select dis,to_date(dt),split(dt,' ')[1]

or

select dis,to_date(dt),substr(dt,12,8)

Demo

with t as (select timestamp '2017-04-06 04:20:33' as dt) 
select to_date(dt),split(dt,' ')[1] from t;
OK
_c0 _c1
2017-04-06  04:20:33

---

with t as (select timestamp '2017-04-06 04:20:33' as dt) 
select to_date(dt),substr(dt,12,8) from t;
OK
_c0 _c1
2017-04-06  04:20:33