Updating unique id column for newly added records in table in hive

问题

I have a table in which I want unique identifier to be added automatically as a new record is inserted into it. Considering I have column for unique identifier already created.

回答1:

hive can't update the table but you can create a temporary table or overwrite your first table. you can also use concat function to join the two diferent column or string. here is the examples

function :concat(string A, string B…)  
return: string  

hive> select concat(‘abc’,'def’,'gh’) from dual;  
abcdefgh  

HQL &result

insert overwrite table stock select tradedate,concat('aa',tradetime),stockid ,buyprice,buysize ,sellprice,sellsize from stock;
20130726    aa094251    204001  6.6 152000  6.605   100
20130726    aa094106    204001  6.45    13400   6.46    100

来源：https://stackoverflow.com/questions/45491829/updating-unique-id-column-for-newly-added-records-in-table-in-hive