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Question 49/72
What are two reasons that a MapReduce job is not run when the following command is executed in Hive?
(Choose two.)
hive> create view v_consolidated_credit_products as select
hcd.customer_id, hcd.credit_card_limits, hcd.credit_balance, hmda.n_mortgages, hmda.mortgage_amount
from mortgages_department_agg hmda join credit_department hcd on
hcd.customer_id=hmda.customer_id;
OK
Time taken: 0.316 seconds
(Choose two.)
hive> create view v_consolidated_credit_products as select
hcd.customer_id, hcd.credit_card_limits, hcd.credit_balance, hmda.n_mortgages, hmda.mortgage_amount
from mortgages_department_agg hmda join credit_department hcd on
hcd.customer_id=hmda.customer_id;
OK
Time taken: 0.316 seconds
Correct Answer: A,D
Explanation/Reference:
The CREATE VIEW statement lets you create a shorthand abbreviation for a more complicated query. The base query can involve joins, expressions, reordered columns, column aliases, and other SQL features that can make a query hard to understand or maintain.
Because a view is purely a logical construct (an alias for a query) with no physical data behind it, ALTER VIEW only involves changes to metadata in the metastore database, not any data files in HDFS.
References: https://www.cloudera.com/documentation/enterprise/5-6-x/topics/impala_create_view.html
The CREATE VIEW statement lets you create a shorthand abbreviation for a more complicated query. The base query can involve joins, expressions, reordered columns, column aliases, and other SQL features that can make a query hard to understand or maintain.
Because a view is purely a logical construct (an alias for a query) with no physical data behind it, ALTER VIEW only involves changes to metadata in the metastore database, not any data files in HDFS.
References: https://www.cloudera.com/documentation/enterprise/5-6-x/topics/impala_create_view.html
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