{"id":968,"date":"2021-07-18T20:27:46","date_gmt":"2021-07-18T20:27:46","guid":{"rendered":"https:\/\/www.wikitechy.com\/interview-questions\/?p=968"},"modified":"2021-09-09T09:28:35","modified_gmt":"2021-09-09T09:28:35","slug":"what-is-the-difference-between-join-and-union","status":"publish","type":"post","link":"https:\/\/www.wikitechy.com\/interview-questions\/sql\/what-is-the-difference-between-join-and-union\/","title":{"rendered":"What is the Difference between join and union ?"},"content":{"rendered":"<div class=\"TextHeading\">\n<div class=\"hddn\">\n<h2 id=\"union\" class=\"color-pink\" style=\"text-align: justify;\"><span style=\"font-family: inherit; font-size: 2rem;\">Union<\/span><\/h2>\n<\/div>\n<\/div>\n<div class=\"Content\" style=\"text-align: justify;\">\n<div class=\"hddn\">\n<ul>\n<li style=\"list-style-type: none;\">\n<ul>\n<li>The union operator combines the results of two or more queries into a single result set. But no.of columns must match in both\/all the queries (and also the order) which are used for union.<\/li>\n<li>We can union two tables irrespective of common field.<\/li>\n<li>The UNION set operator is used for combining data from two tables which have columns with the same datatype.\n<ul>\n<li>Union \u2013 Returns with no duplicate rows.<\/li>\n<li>Union all \u2013 Retruns with duplicate rows (No. of rows returned = No. of rows in Query1 + No. of rows in Query 2).<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<div class=\"ImageContent\">\n<div class=\"hddn\"><img fetchpriority=\"high\" decoding=\"async\" class=\"alignnone size-medium aligncenter\" src=\"https:\/\/cdn.wikitechy.com\/interview-questions\/sql\/union-unionall-except-intersect.jpg\" alt=\"Union unionall except intersect\" width=\"781\" height=\"156\" \/><\/div>\n<\/div>\n<ul>\n<li>We cannot use the union operator within a create view statement.<\/li>\n<li>We cannot use the union operator on text and image columns.<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<div class=\"ImageContent\" style=\"text-align: justify;\">\n<div class=\"hddn\"><img decoding=\"async\" class=\"alignnone size-medium aligncenter\" src=\"https:\/\/cdn.wikitechy.com\/interview-questions\/sql\/union-command-sql.gif\" alt=\"Union in SQL\" width=\"345\" height=\"225\" \/><\/div>\n<\/div>\n<div class=\"TextHeading\" style=\"text-align: justify;\">\n<div class=\"hddn\">\n<h2 id=\"syntax\" class=\"color-blue\">Syntax<\/h2>\n<div class=\"code-embed-wrapper\"> <div class=\"code-embed-infos\"> <\/div> <pre class=\"language-sql code-embed-pre line-numbers\"  data-start=\"1\" data-line-offset=\"0\"><code class=\"language-sql code-embed-code\">SELECT expression1, expression2, ... expression_n<br\/>FROM tables<br\/>[WHERE conditions]<br\/>UNION<br\/>SELECT expression1, expression2, ... expression_n<br\/>FROM tables<br\/>[WHERE conditions];<\/code><\/pre> <\/div>\n<\/div>\n<\/div>\n<div class=\"TextHeading\" style=\"text-align: justify;\">\n<div class=\"hddn\">\n<h2 id=\"join\" class=\"color-blue\">Join<\/h2>\n<\/div>\n<\/div>\n<div class=\"Content\" style=\"text-align: justify;\">\n<div class=\"hddn\">\n<ul>\n<li>Joins are used to extract information from more than one table based on the related column\/coloums (PK and RFK) any no. of rows can be retrived based on matching colums.<\/li>\n<li>We can join two tables by \u2018join\u2019 if they have common field.<\/li>\n<li>A Join is used for displaying columns with the same or different names from different tables.<\/li>\n<li>Different types of joins are\u00a0Inner join=equi join=join ,\u00a0<a href=\"https:\/\/www.wikitechy.com\/tutorials\/sql\/outer-join-in-sql\">outer join<\/a> (Right outer join\/right join,\u00a0<a href=\"https:\/\/www.wikitechy.com\/tutorials\/sql\/left-outer-join-in-sql\">Left outer join<\/a> \/ left join),\u00a0<a href=\"https:\/\/www.wikitechy.com\/tutorials\/sql\/cross-join\">Cross join<\/a> , and full outer join\/outer join.<\/li>\n<li>We can use join operator within a create view statement.<\/li>\n<li>We can use the join operator on text and image columns.<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<div class=\"ImageContent\" style=\"text-align: justify;\">\n<div class=\"hddn\"><img decoding=\"async\" class=\"alignnone size-medium aligncenter\" src=\"https:\/\/cdn.wikitechy.com\/interview-questions\/sql\/cross-join.png\" alt=\"Cross Join\" width=\"341\" height=\"213\" \/><\/div>\n<\/div>\n<div class=\"TextHeading\" style=\"text-align: justify;\">\n<div class=\"hddn\">\n<h2 id=\"syntax-2\" class=\"color-blue\">Syntax<\/h2>\n<div class=\"code-embed-wrapper\"> <div class=\"code-embed-infos\"> <\/div> <pre class=\"language-sql code-embed-pre line-numbers\"  data-start=\"1\" data-line-offset=\"0\"><code class=\"language-sql code-embed-code\">SELECT column-names<br\/>FROM table-name1 JOIN table-name2 <br\/>ON column-name1 = column-name2<br\/>WHERE condition<\/code><\/pre> <\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Answer : The union operator combines the results of two or more queries into a single result set&#8230;<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6547],"tags":[195,6595,203,199,214,198,209,283,205,6742,6787,6743,6744,6745,6746,2936,222,6775,484,196,212,6776,6772,6773,286,6778,6777,970,207,6771,6747,6784,6748,6749,6750,204,6751,6774,6752,282,208,288,206,6753,6754,6767,6755,6630,6756,6770,6769,6757,6758,6768,6779,6781,6759,6760,6761,6762,6763,975,200,6780,6786,6764,6765,6766,6783,197,284,280,364,6785,6782,285,15907],"class_list":["post-968","post","type-post","status-publish","format-standard","hentry","category-sql","tag-accenture-interview-questions-and-answers","tag-allstate-solut-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-chetu-interview-questions-and-answers","tag-collabera-technologies-interview-questions-and-answers","tag-conduent-interview-questions-and-answers","tag-dell-international-services-india-pvt-ltd-interview-questions-and-answers","tag-difference-between-cartesian-product-and-union","tag-difference-between-join-and-union","tag-difference-between-join-and-union-with-example","tag-difference-between-or-and-union-in-sql","tag-difference-between-union-all-and-union","tag-difference-between-union-and-full-outer-joinfull-outer-join-vs-union-all-performance","tag-fis-global-business-solutions-india-pvt-ltd-interview-questions-and-answers","tag-flipkart-interview-questions-and-answers","tag-full-outer-join","tag-genpact-interview-questions-and-answers","tag-ibm-interview-questions-and-answers","tag-indecomm-global-services-interview-questions-and-answers","tag-inner-join","tag-join","tag-joins","tag-lt-infotech-interview-questions-and-answers","tag-left-join","tag-left-outer-join","tag-mindtree-interview-questions-and-answers","tag-mphasis-interview-questions-and-answers","tag-mysql-inner-join","tag-mysql-join","tag-mysql-union","tag-mysql-union-example","tag-mysql-union-join-difference","tag-natural-join-in-sql","tag-oracle-corporation-interview-questions-and-answers","tag-oracle-sql-union","tag-outer-join","tag-outer-join-in-sql","tag-persistent-systems-interview-questions-and-answers","tag-prokarma-softech-pvt-ltd-interview-questions-and-answers","tag-r-systems-interview-questions-and-answers","tag-sap-labs-india-pvt-ltd-interview-questions-and-answers","tag-self-join-in-sql","tag-sql-full-join","tag-sql-inner-join","tag-sql-inner-join-where","tag-sql-join","tag-sql-join-3-tables","tag-sql-join-types","tag-sql-left-join","tag-sql-left-outer-join","tag-sql-multiple-joins","tag-sql-outer-join","tag-sql-union","tag-sql-union-all","tag-sql-union-all-example","tag-sql-union-distinct","tag-sql-union-order-by","tag-sql-union-vs-join","tag-sql-union-vs-union-all","tag-tata-consultancy-service-interview-questions-and-answers","tag-tech-mahindra-interview-questions-and-answers","tag-trade-union","tag-union-all","tag-union-and-join-together-in-sql","tag-union-in-sql-server","tag-union-vs-join-performance","tag-unions","tag-unitedhealth-group-interview-questions-and-answers","tag-valuelabs-interview-questions-and-answers","tag-virtusa-consulting-services-pvt-ltd-interview-questions-and-answers","tag-wells-fargo-interview-questions-and-answers","tag-what-is-a-union","tag-workers-union","tag-xoriant-solutions-pvt-ltd-interview-questions-and-answers","tag-xt-global-interview-questions-and-answers"],"yoast_head":"<!-- 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