Re:Re: update a hive table
I see, thanks. At 2012-03-16 20:30:24,"Bejoy Ks" wrote: Hi Robert, Sorry I missed answering your question >If mytable has many columns but I only need to update one of them, how can I >write the >statement short? It is not possible in hive. At a bare minimum hive would overwrite a partition (not even a record/file) if you frame an optimized query. Hope it helps!... Regards Bejoy.K.S From: Bejoy Ks To: "user@hive.apache.org" Sent: Friday, March 16, 2012 5:56 PM Subject: Re: update a hive table Hey Richard First, don't treat hive as a database. Hive is just an interface above map reduce that help you write SQL like queries that inturn is converted to MR jobs. Saying that hive doesn't support update. If you are just experimenting, the query that you wrote would overwrite a whole record (in a broader context a whole partion/table) Regards Bejoy.K.S From: Richard To:user@hive.apache.org Sent: Friday, March 16, 2012 4:26 PM Subject: update a hive table if I wang to update a table, e.g, insert overwrite table mytable select lower(col1), col2, col3 from mytable; if mytable has many columns but I only need to update one of them, how can I write the statement short?
Re: update a hive table
create a new table and copy the data from your source table by doing lower(col1), drop the old table and rename the new table to old table. On Fri, Mar 16, 2012 at 3:56 AM, Richard wrote: > if I wang to update a table, e.g, > > insert overwrite table mytable > select lower(col1), col2, col3 from mytable; > > if mytable has many columns but I only need to update one of them, how can > I write the > statement short? > > > >
Re: update a hive table
Hi Robert, Sorry I missed answering your question >If mytable has many columns but I only need to update one of them, how can I >write the >statement short? It is not possible in hive. At a bare minimum hive would overwrite a partition (not even a record/file) if you frame an optimized query. Hope it helps!... Regards Bejoy.K.S From: Bejoy Ks To: "user@hive.apache.org" Sent: Friday, March 16, 2012 5:56 PM Subject: Re: update a hive table Hey Richard First, don't treat hive as a database. Hive is just an interface above map reduce that help you write SQL like queries that inturn is converted to MR jobs. Saying that hive doesn't support update. If you are just experimenting, the query that you wrote would overwrite a whole record (in a broader context a whole partion/table) Regards Bejoy.K.S From: Richard To: user@hive.apache.org Sent: Friday, March 16, 2012 4:26 PM Subject: update a hive table if I wang to update a table, e.g, insert overwrite table mytable select lower(col1), col2, col3 from mytable; if mytable has many columns but I only need to update one of them, how can I write the statement short?
Re: update a hive table
Hey Richard First, don't treat hive as a database. Hive is just an interface above map reduce that help you write SQL like queries that inturn is converted to MR jobs. Saying that hive doesn't support update. If you are just experimenting, the query that you wrote would overwrite a whole record (in a broader context a whole partion/table) Regards Bejoy.K.S From: Richard To: user@hive.apache.org Sent: Friday, March 16, 2012 4:26 PM Subject: update a hive table if I wang to update a table, e.g, insert overwrite table mytable select lower(col1), col2, col3 from mytable; if mytable has many columns but I only need to update one of them, how can I write the statement short?
update a hive table
if I wang to update a table, e.g, insert overwrite table mytable select lower(col1), col2, col3 from mytable; if mytable has many columns but I only need to update one of them, how can I write the statement short?
