how to create pivot/transpose table in hive - hive

Question

select st_date,st_symbol,st_adjclose from table;
2019-02-19 MSFT 107.71
2019-02-20 MSFT 107.15
2019-03-01 AAPL 174.97
2019-01-02 AAPL 157.25
2019-01-08 AMZN 1656.58
2019-01-07 AMZN 1629.51
2019-01-03 GOOGL 1025.47
2019-01-04 GOOGL 1078.07
date MSFT AAPL AMZN GOOGL
2019-02-19 107.71 141.58 141.58 141.58
2019-02-20 107.71 157.25 157.25 157.25
2019-02-22 110.97 157.25 157.25 157.25

Answer 1

If you know in advance which stock symbols you want in your query, then you can do it using MAP :
SELECT st_date,
SUM(t.value_map['MSFT']) AS MSFT,
SUM(t.value_map['AAPL']) AS AAPL,
SUM(t.value_map['AMZN']) AS AMZN,
SUM(t.value_map['GOOGL']) AS GOOGL
FROM (
SELECT st_date,
map(st_symbol,st_adjclose) AS value_map
FROM (
SELECT st_date,
st_symbol,
st_adjclose
FROM TABLE ) x ) t
GROUP BY st_date;
Let me know if it works