{"id":163,"date":"2021-07-12T06:29:06","date_gmt":"2021-07-12T06:29:06","guid":{"rendered":"https:\/\/www.wikitechy.com\/interview-questions\/?p=163"},"modified":"2021-09-15T04:59:49","modified_gmt":"2021-09-15T04:59:49","slug":"what-is-the-usage-of-foreach-operation-in-pig-scripts","status":"publish","type":"post","link":"https:\/\/www.wikitechy.com\/interview-questions\/apache-pig\/what-is-the-usage-of-foreach-operation-in-pig-scripts\/","title":{"rendered":"What is the usage of FOREACH operation in Pig scripts ?"},"content":{"rendered":"
\n
\n

Usage of FOREACH operation in Pig scripts<\/h2>\n<\/div>\n<\/div>\n
\n
\n
    \n
  • The FOREACH operator is used to generate specified data transformations based on the column data.<\/li>\n<\/ul>\n<\/div>\n<\/div>\n
    \n
    \n

    Syntax:<\/h2>\n<\/div>\n<\/div>\n
    \n
    \n
    <\/div> 
    grunt> Relation_name2 = FOREACH Relatin_name1 GENERATE (required data);<\/code><\/pre> <\/div><\/figure>\n<\/div>\n<\/div>\n
    Pig FOREACH can be used in two ways:<\/p>\n
    \n
    \n
      \n
    1. Simple FOREACH\u2026GENERATE<\/li>\n
    2. Nested FOREACH {\u2026GENERATE }<\/li>\n<\/ol>\n<\/div>\n<\/div>\n
      \n
      \n
      Simple FOREACH\u2026GENERATE:<\/h2>\n<\/div>\n<\/div>\n
      \n
      \n
        \n
      • This is simple to use the FOREACH\u2026GENERATE in a single line of pig statement to generate the columns that we need.<\/li>\n
      • Relation_Name = FOREACH  GENERATE column1, column2\u2026..;<\/li>\n<\/ul>\n<\/div>\n<\/div>\n
        \n
        \n
        Nested FOREACH {\u2026GENERATE }<\/h2>\n<\/div>\n<\/div>\n
        \n
        \n
          \n
        • Use operators such as DISTINCT, FILTER, LIMIT, ORDER and SAMPLE.<\/li>\n<\/ul>\n<\/div>\n<\/div>\n
          \n
          \n
          Syntax:<\/h2>\n<\/div>\n<\/div>\n
          \n
          \n
           
           <\/div> 
          Relation_Name = FOREACH Nested_Relation_Name {Inner Relation = Nested_Operation; GENERATE expression [, expression \u2026] };<\/code><\/pre> <\/div><\/figure>\n<\/div>\n<\/div>\n
          \n
          \n
            \n
          • \n
              \n
            • It should be taken set of expressions and it applied to every record in the data pipeline, hence define as FOREACH.<\/li>\n
            • The pipeline to next operator.For those database, it is Pig\u2019s projection operator.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n
              For example, the code loads an entire record, then it removes all user and id fields from each record:<\/p>\n
                \n
              • \n
                  \n
                • A = load \u2018input\u2019 as (user:chararray, id:long, address:chararray, phone:chararray, preferences:map[]);<\/li>\n
                • B = foreach A generate user, id;<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/div>\n<\/div>\n
                  \n
                  \"what-is-the-usage-of-foreach-operation-in-pig-scripts\"<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"
                  Answer:The FOREACH operator is used to generate specified data transformations based on the column data.<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[456],"tags":[195,365,509,491,551,203,199,214,209,488,205,485,486,222,484,490,196,286,550,207,487,217,548,552,546,545,477,508,517,518,519,544,468,489,493,367,483,549,555,492,200,197,280,364,285],"class_list":["post-163","post","type-post","status-publish","format-standard","hentry","category-apache-pig","tag-accenture-interview-questions-and-answers","tag-amazon-development-centre-india-pvt-ltd-interview-questions-and-answers","tag-apache-pig-interview-questions","tag-applied-materials-interview-questions-and-answers","tag-assert-operator-in-pig","tag-capgemini-interview-questions-and-answers","tag-casting-networks-india-pvt-limited-interview-questions-and-answers","tag-cgi-group-inc-interview-questions-and-answers","tag-collabera-technologies-interview-questions-and-answers","tag-crisil-limited-interview-questions-and-answers","tag-dell-international-services-india-pvt-ltd-interview-questions-and-answers","tag-ernst-young-interview-questions-and-answers","tag-exide-industries-interview-questions-and-answers","tag-flipkart-interview-questions-and-answers","tag-genpact-interview-questions-and-answers","tag-hexaware-technologies-interview-questions-and-answers","tag-ibm-interview-questions-and-answers","tag-lt-infotech-interview-questions-and-answers","tag-limit-rows-in-pig","tag-mphasis-interview-questions-and-answers","tag-myntra-designs-pvt-ltd-interview-questions-and-answers","tag-peoplestrong-interview-questions-and-answers","tag-pig-evaluation-operators","tag-pig-foreach-generate-example","tag-pig-generate-all-columns","tag-pig-generate-group","tag-pig-interview-questions","tag-pig-interview-questions-and-answers","tag-pig-interview-questions-and-answers-for-experienced","tag-pig-interview-questions-for-experienced","tag-pig-interview-questions-for-experienced-and-freshers","tag-pig-nested-foreach-filter","tag-pig-practice-questions","tag-prokarma-softech-nterview-questions-and-answers","tag-quintiles-interview-questions-and-answers","tag-rbs-india-development-centre-pvt-ltd-interview-questions-and-answers","tag-reliance-industries-ltd-interview-questions-and-answers","tag-store-operator-in-pig","tag-stream-function-in-pig","tag-syngene-international-limited-interview-questions-and-answers","tag-tech-mahindra-interview-questions-and-answers","tag-unitedhealth-group-interview-questions-and-answers","tag-virtusa-consulting-services-pvt-ltd-interview-questions-and-answers","tag-wells-fargo-interview-questions-and-answers","tag-xoriant-solutions-pvt-ltd-interview-questions-and-answers"],"yoast_head":"\nWhat is the usage of FOREACH operation in Pig scripts ? 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