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From "Mich Talebzadeh" <m...@peridale.co.uk>
Subject RE: foreign keys in Hive
Date Sun, 10 Jan 2016 19:09:46 GMT
Hi,

 

Primary key and foreign key constraints are really more applicable to transactional databases
where the transaction logic needs to be enforced. That is once a unit of work is completed
it is either committed or rolled back.

 

It does not really make sense to enforce the same logic in Hive which is built on schema on
read. Once you start adding foreign keys constraints to Hive, you are actually making it “schema
on read”. Case in point if you want to add data to multiple tables in Hive, then you have
to know the schema in advance as your data may be rejected (say you are inserting into child
table without the corresponding record in parent table). This is not what Hive is designed
for in my opinion.

 

 

HTH,

 

 

Dr Mich Talebzadeh

 

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From: Ashok Kumar [mailto:ashok34668@yahoo.com] 
Sent: 10 January 2016 14:45
To: User <user@hive.apache.org>
Subject: foreign keys in Hive

 

hi,

 

what is the equivalent to foreign keys in Hive?

 

Thanks

 


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