12 Questions
The LOAD statement in Pig is used to read data from a file in the Hadoop Distributed File System (HDFS).
True
The FILTER statement in Pig is used to remove records from a relation based on a specified condition.
True
The STORE statement in Pig is used to write data to a file in the local file system.
False
The GROUP statement in Pig is used to group records in a relation by one or more columns.
True
The FOREACH...GENERATE statement in Pig is used to perform calculations or transformations on groups of records.
True
Pig Latin statements are executed in a sequential order, similar to SQL queries.
True
Pig is a data warehouse system used for querying and analyzing large datasets stored in HDFS.
False
The GROUP statement in Pig is used to group data by a specific column.
True
The FOREACH...GENERATE statement in Pig is used to perform calculations or transformations on the data.
True
The STORE statement in Pig is used to write the result of a Pig script to a specific output directory in HDFS.
True
HiveQL is a query language used in Pig for processing and analyzing large datasets.
False
The JOIN statement in Pig is used to perform an outer join between two datasets.
False
Study Notes
Pig Latin Statements
- LOAD function: loads data from HDFS using PigStorage, which interprets fields separated by commas.
- FILTER function: filters data to include only records that meet specified conditions (e.g., age > 25).
- STORE function: writes the result to the 'output' directory.
Grouping and Aggregation
- GROUP function: groups data by the specified column (e.g., department).
- FOREACH...GENERATE statement: calculates the average salary for each department using the AVG function.
- STORE function: writes the result to the 'output' directory.
Joining Data
- JOIN function: performs an inner join on the specified column (e.g., department_id) between two datasets.
- FOREACH...GENERATE statement: selects the relevant columns (e.g., employee_id, name, department_name).
- STORE function: writes the joined and selected data to the 'output' directory.
Hive
- Hive is a data warehouse system used for querying and analyzing large datasets stored in HDFS.
- Hive uses a query language called HiveQL, which is similar to SQL.
- Hive has a specific architecture for querying and analyzing data.
This quiz compares loading relations from files in the PIG buffer and storing data by writing output to the file system. It covers Pig processing of Pig Latin statements, relations performed by developers in Big Data and Hadoop, loading, and filtering data from HDFS.
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