Data Flow Language-PIG

[#1]

Hello Everyone,

Why is PIG called a data flow language?

Thank you.

[#2]

As you said yes it is a data folow language rather than a query language .

because you write series declaritive of statement that defines relations 

where each relations performs new set of data transformation. 

To put simple it like how to reterive data rather how you want data  - like more of query optimizer (example)

Mainly used in ETL to ingest external data into Hadoop. 

hope this suffice 

[#3]

Hello csguna,

Thanks for your response. Could you please explain it with one example. That will be much better.

[#4 · Accepted solution]

@Geek007

in other words 

in SQL  We say “what” is to be accomplished

in Pig,  we mention “how” a task is to be performed.

when to go for Pig - When we want to process larget set of unorganized, unstructured and decentralized data

Pig doesnt need to have a schema , it will consume unstructured data with delimiters . 

please look in to this example . 

https://martin.atlassian.net/wiki/pages/viewpage.action?pageId=23494745

let me know if this suffice