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Questions and Answers
The LOAD statement in Pig is used to read data from a file in the Hadoop Distributed File System (HDFS).
The LOAD statement in Pig is used to read data from a file in the Hadoop Distributed File System (HDFS).
True (A)
The FILTER statement in Pig is used to remove records from a relation based on a specified condition.
The FILTER statement in Pig is used to remove records from a relation based on a specified condition.
True (A)
The STORE statement in Pig is used to write data to a file in the local file system.
The STORE statement in Pig is used to write data to a file in the local file system.
False (B)
The GROUP statement in Pig is used to group records in a relation by one or more columns.
The GROUP statement in Pig is used to group records in a relation by one or more columns.
The FOREACH...GENERATE statement in Pig is used to perform calculations or transformations on groups of records.
The FOREACH...GENERATE statement in Pig is used to perform calculations or transformations on groups of records.
Pig Latin statements are executed in a sequential order, similar to SQL queries.
Pig Latin statements are executed in a sequential order, similar to SQL queries.
Pig is a data warehouse system used for querying and analyzing large datasets stored in HDFS.
Pig is a data warehouse system used for querying and analyzing large datasets stored in HDFS.
The GROUP statement in Pig is used to group data by a specific column.
The GROUP statement in Pig is used to group data by a specific column.
The FOREACH...GENERATE statement in Pig is used to perform calculations or transformations on the data.
The FOREACH...GENERATE statement in Pig is used to perform calculations or transformations on the data.
The STORE statement in Pig is used to write the result of a Pig script to a specific output directory in HDFS.
The STORE statement in Pig is used to write the result of a Pig script to a specific output directory in HDFS.
HiveQL is a query language used in Pig for processing and analyzing large datasets.
HiveQL is a query language used in Pig for processing and analyzing large datasets.
The JOIN statement in Pig is used to perform an outer join between two datasets.
The JOIN statement in Pig is used to perform an outer join between two datasets.
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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.
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