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{"id":602,"date":"2021-07-13T22:18:52","date_gmt":"2021-07-13T22:18:52","guid":{"rendered":"https:\/\/www.wikitechy.com\/interview-questions\/?p=602"},"modified":"2021-09-11T11:49:31","modified_gmt":"2021-09-11T11:49:31","slug":"what-is-the-difference-between-select-from-table-and-select-column-from-table-in-hive","status":"publish","type":"post","link":"https:\/\/www.wikitechy.com\/interview-questions\/hive\/what-is-the-difference-between-select-from-table-and-select-column-from-table-in-hive\/","title":{"rendered":"What is the difference between &#8216;select from table&#8217; and &#8216;select column from table&#8217; in hive ?"},"content":{"rendered":"<div class=\"TextHeading\">\n<div class=\"hddn\">\n<h2 id=\"difference-between-select-from-table-and-select-column-from-table-in-hive\" class=\"color-green\" style=\"text-align: justify;\">Difference between &#8216;select * from table&#8217; and &#8216;select column from table&#8217; in hive<\/h2>\n<\/div>\n<\/div>\n<div class=\"Content\" style=\"text-align: justify;\">\n<div class=\"hddn\">\n<ul>\n<li>Table in Hive is stored as a directory in the HDFS.<\/li>\n<li>Using select from table the Hive query processor simply goes directory that have one or more files in table schema.<\/li>\n<li>You may do this if you have very small data like less than a Gigabyte.<\/li>\n<li>In real clusters if you hit \u2018select * from table\u2019, it may have data in Terabytes and displaying that will run for long time.<\/li>\n<li>Hive achieved sequence of map reduce programs that reads data from table stored on Hadoop Distributed File System.<\/li>\n<li>Any data processing you do in Hive is achieved through sequence of map reduce programs that reads data from table stored on HDFS.<\/li>\n<li>Hive map reduce based on query processing engine.<\/li>\n<li>Tables have wide number of columns that representing different values.To perform select column the map reduce program will scan all rows and extract a column.<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<div class=\"text-center row\" style=\"text-align: justify;\">\n<div class=\"col-sm-12\">\n<div id=\"bsa-zone_1590522538159-8_123456\"><\/div>\n<\/div>\n<\/div>\n<div class=\"ImageContent\">\n<div class=\"hddn\" style=\"text-align: justify;\"><a href=\"https:\/\/cdn.wikitechy.com\/interview-questions\/hive\/select-from-table-and-select-column-from-table-in-hive.png\"><img decoding=\"async\" class=\"aligncenter size-medium\" src=\"https:\/\/cdn.wikitechy.com\/interview-questions\/hive\/select-from-table-and-select-column-from-table-in-hive.png\" alt=\"select-from-table-and-select-column-from-table-in-hive\" width=\"288\" height=\"149\" \/><\/a><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Answer : Table in Hive is stored as a directory in the HDFS&#8230;<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"passster_activate_protection":false,"passster_protect_child_pages":"","passster_protection_type":"password","passster_password":"","passster_activate_overwrite_defaults":"","passster_headline":"","passster_instruction":"","passster_placeholder":"","passster_button":"","passster_id":"","passster_activate_misc_settings":"","passster_redirect_url":"","passster_hide":"no","passster_area_shortcode":"","gtb_hide_title":false,"gtb_wrap_title":false,"gtb_class_title":"","gtb_remove_headerfooter":false,"footnotes":""},"categories":[3782],"tags":[195,971,3799,203,199,214,209,205,3985,3974,222,484,3787,3795,621,3984,3986,620,3882,196,3716,712,970,366,208,288,483,976,975,200,974,197,280,364,968,216,2119,969],"class_list":["post-602","post","type-post","status-publish","format-standard","hentry","category-hive","tag-accenture-interview-questions-and-answers","tag-altimetrik-india-pvt-ltd-interview-questions-and-answers","tag-ani-technologies-pvt-ltd-interview-questions-and-answers","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-dell-international-services-india-pvt-ltd-interview-questions-and-answers","tag-explain-in-hive","tag-explain-the-difference-between-sql-and-apache-hive","tag-flipkart-interview-questions-and-answers","tag-genpact-interview-questions-and-answers","tag-hive-interview-questions","tag-hive-interview-questions-and-answers","tag-hive-query-based-interview-questions","tag-hive-query-without-mapreduce","tag-hive-questions","tag-hive-scenario-based-interview-questions","tag-how-will-you-optimize-hive-performance","tag-ibm-interview-questions-and-answers","tag-impetus-technologies-interview-questions-and-answers","tag-indiabulls-technology-solutions-ltd-interview-questions-and-answers","tag-mindtree-interview-questions-and-answers","tag-netapp-interview-questions-and-answers","tag-prokarma-softech-pvt-ltd-interview-questions-and-answers","tag-r-systems-interview-questions-and-answers","tag-reliance-industries-ltd-interview-questions-and-answers","tag-synechron-te-interview-questions-and-answers","tag-tata-consultancy-service-interview-questions-and-answers","tag-tech-mahindra-interview-questions-and-answers","tag-trigent-software-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-wipro-infotech-interview-questions-and-answers","tag-wipro-interview-questions-and-answers","tag-yash-technologies-interview-questions-and-answers","tag-yodlee-infotech-pvt-ltd-interview-questions-and-answers"],"yoast_head":"<!-- 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