{"id":4844,"date":"2022-09-26T09:24:54","date_gmt":"2022-09-26T09:24:54","guid":{"rendered":"https:\/\/www.wikitechy.com\/interview-questions\/?p=4844"},"modified":"2022-09-26T09:35:23","modified_gmt":"2022-09-26T09:35:23","slug":"what-is-a-join-in-sql-what-are-the-types-of-joins","status":"publish","type":"post","link":"https:\/\/www.wikitechy.com\/interview-questions\/sql\/what-is-a-join-in-sql-what-are-the-types-of-joins\/","title":{"rendered":"What is a join in SQL ? What are the types of joins ?"},"content":{"rendered":"<ul>\n<li style=\"text-align: justify;\">Data is stored in multiple tables that are related to each other in relational data bases like SQL Server, MySQL etc with a common key value.<\/li>\n<li style=\"text-align: justify;\">When we need to get row by combining one or more tables based on common fields between them can be achieved using a SQL Join.<\/li>\n<li style=\"text-align: justify;\">When we need to extract records from two or more tables into a new table, JOIN clause helps us to acheive this based on certain condition.<\/li>\n<li style=\"text-align: justify;\">Based on logical relationship between tables join clause helps us to query and access data from multiple tables.<\/li>\n<li style=\"text-align: justify;\">In other words, Join show how data from a row can be fetched from one table to another table.<\/li>\n<\/ul>\n<p style=\"text-align: justify;\">Different types of Joins are:<\/p>\n<ul style=\"text-align: justify;\">\n<li>Inner join\/Simple Join<\/li>\n<li>Left Outer join\/Left Join<\/li>\n<li>Right Outer Join\/Right join<\/li>\n<li>Full Outer join<\/li>\n<li>Cross Join<\/li>\n<li>Self Join<\/li>\n<\/ul>\n<p><img fetchpriority=\"high\" decoding=\"async\" class=\"alignnone size-full wp-image-4848 aligncenter\" src=\"https:\/\/www.wikitechy.com\/interview-questions\/wp-content\/uploads\/2022\/09\/different-types-of-joins.jpg\" alt=\"\" width=\"468\" height=\"384\" srcset=\"https:\/\/www.wikitechy.com\/interview-questions\/wp-content\/uploads\/2022\/09\/different-types-of-joins.jpg 468w, https:\/\/www.wikitechy.com\/interview-questions\/wp-content\/uploads\/2022\/09\/different-types-of-joins-300x246.jpg 300w, https:\/\/www.wikitechy.com\/interview-questions\/wp-content\/uploads\/2022\/09\/different-types-of-joins-390x320.jpg 390w\" sizes=\"(max-width: 468px) 100vw, 468px\" \/><\/p>\n<h3 id=\"inner-join\" style=\"text-align: justify;\"><strong>Inner Join<\/strong><\/h3>\n<ul style=\"text-align: justify;\">\n<li>In SQL if a defined condition is valid the inner join will select all the matching rows and columns from both tables.<\/li>\n<\/ul>\n<p style=\"text-align: justify;\"><strong>Syntax<\/strong><\/p>\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_1, column_2 column_3 from table_1 innerjoin table_2 ON table_1.column = table_2.column;<\/code><\/pre> <\/div>\n<h3 id=\"left-join\" style=\"text-align: justify;\"><strong>Left Join<\/strong><\/h3>\n<ul style=\"text-align: justify;\">\n<li>In left join all records are retrived from left table(table1) and matched rows and column from right table(table2).<\/li>\n<li>If there is no matching rows or columns, left join returns NULL.<\/li>\n<\/ul>\n<p style=\"text-align: justify;\"><strong>Syntax<\/strong><\/p>\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_1, column_2, columns from Table_1 left join table_2 ON table_1.column_name = table_2.column name.<\/code><\/pre> <\/div>\n<h3 id=\"right-join-or-right-outer-join\" style=\"text-align: justify;\"><strong>Right Join or Right Outer Join<\/strong><\/h3>\n<ul style=\"text-align: justify;\">\n<li>Records from the right table are retrived in RIGHT JOIN and the matched rows or columns from the left table(table1).<\/li>\n<li>If there is no matching rows or columns it will return NULL.<\/li>\n<\/ul>\n<p style=\"text-align: justify;\"><strong>Syntax<\/strong><\/p>\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_1, column_2, cloumn(s) FROM table_1 right join table_2 ON table_1.column_name= table2.column_name.<\/code><\/pre> <\/div>\n<h3 id=\"full-join-or-full-outer-join\" style=\"text-align: justify;\"><strong>Full Join or Full Outer Join<\/strong><\/h3>\n<ul style=\"text-align: justify;\">\n<li>This join is a combination of both Left join and right join.<\/li>\n<li>The joined tables returns all the records from both the tables.<\/li>\n<li>If no matches are found in the table, this join will return a NULL Value.<\/li>\n<li>It is also called as Full Outer Join.<\/li>\n<\/ul>\n<p style=\"text-align: justify;\"><strong>Syntax<\/strong><\/p>\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_1, column_2, column(s) from table_1 Full join table_2 ON table_1.column_name = table_2.column_name;<\/code><\/pre> <\/div>\n<h3 id=\"cross-join\" style=\"text-align: justify;\"><strong>Cross Join<\/strong><\/h3>\n<ul style=\"text-align: justify;\">\n<li>It is also known as Cartesian Join which returns cartesian product of two or more joined tables.<\/li>\n<li>Cross join produces a table that merges each rows from the first table with each rows of second table.<\/li>\n<li>No condition ir required for CROSS JOIN.<\/li>\n<\/ul>\n<p style=\"text-align: justify;\"><strong>Syntax<\/strong><\/p>\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 * from table_1 cross join table_2;  <br\/>Or,<br\/>Select column1, column2, column3 from table_1, table_2; <\/code><\/pre> <\/div>\n<h3 id=\"self-join\" style=\"text-align: justify;\"><strong>Self Join<\/strong><\/h3>\n<ul style=\"text-align: justify;\">\n<li>Tables formed by joining itself is called Self Join.<\/li>\n<li>It makes a temporary naming of atleast one table in SQL Statement.<\/li>\n<\/ul>\n<p style=\"text-align: justify;\"><strong>Syntax<\/strong><\/p>\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 column1, column2, column(s) from table_1 Tbl1, table_2 Tbl2 where condition;  <\/code><\/pre> <\/div>\n<p style=\"text-align: justify;\">\n","protected":false},"excerpt":{"rendered":"<p>Data is stored in multiple tables that are related to each other in relational data bases like SQL Server, MySQL etc with a common key value. When we need to get row by combining one or more tables based on common fields between them can be achieved using a SQL Join. When we need to [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6547],"tags":[18573,18570,18572,6752,6753,18569,17428,18568,18574,18571,18575,18565,18566,18567],"class_list":["post-4844","post","type-post","status-publish","format-standard","hentry","category-sql","tag-cross-join-in-sql","tag-different-types-of-sql-joins","tag-inner-join-in-sql","tag-outer-join-in-sql","tag-self-join-in-sql","tag-sql-join-types-explained","tag-sql-joins","tag-sql-joins-explained","tag-types-of-joins-in-dbms","tag-types-of-joins-in-sql-server","tag-types-of-joins-in-sql-with-example","tag-types-of-sql-join","tag-types-of-sql-joins-explained-with-examples","tag-what-are-sql-joins"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>What is a join in SQL ? 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