{"id":2210,"date":"2024-03-12T09:25:12","date_gmt":"2024-03-12T09:25:12","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/how-to-carry-out-complex-queries-and-subqueries-in-hive\/"},"modified":"2024-04-13T16:11:02","modified_gmt":"2024-04-13T16:11:02","slug":"how-to-carry-out-complex-queries-and-subqueries-in-hive","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/how-to-carry-out-complex-queries-and-subqueries-in-hive\/","title":{"rendered":"How to carry out complex queries and subqueries in Hive"},"content":{"rendered":"<p>Executing complex queries and subqueries in <a href=\"https:\/\/hive.apache.org\/\">Hive<\/a> can be achieved by using the HiveQL language. HiveQL is similar to SQL and can be used to write complex query statements.<\/p>\n<p>Here are some examples of complex queries and subqueries.<\/p>\n<ol>\n<li>Find the name of the product with the highest sales using a subquery.<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">SELECT<\/span> product_name \r\n<span class=\"hljs-keyword\">FROM<\/span> products \r\n<span class=\"hljs-keyword\">WHERE<\/span> product_id <span class=\"hljs-operator\">=<\/span> (\r\n    <span class=\"hljs-keyword\">SELECT<\/span> product_id \r\n    <span class=\"hljs-keyword\">FROM<\/span> sales \r\n    <span class=\"hljs-keyword\">GROUP<\/span> <span class=\"hljs-keyword\">BY<\/span> product_id \r\n    <span class=\"hljs-keyword\">ORDER<\/span> <span class=\"hljs-keyword\">BY<\/span> <span class=\"hljs-built_in\">sum<\/span>(sales_amount) <span class=\"hljs-keyword\">DESC<\/span> \r\n    LIMIT <span class=\"hljs-number\">1<\/span>\r\n);\r\n<\/code><\/pre>\n<ol>\n<li>Calculate the total sales for each department by using JOIN and aggregate functions.<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">SELECT<\/span> department_name, <span class=\"hljs-built_in\">sum<\/span>(sales_amount) <span class=\"hljs-keyword\">as<\/span> total_sales\r\n<span class=\"hljs-keyword\">FROM<\/span> sales\r\n<span class=\"hljs-keyword\">JOIN<\/span> departments <span class=\"hljs-keyword\">ON<\/span> sales.department_id <span class=\"hljs-operator\">=<\/span> departments.department_id\r\n<span class=\"hljs-keyword\">GROUP<\/span> <span class=\"hljs-keyword\">BY<\/span> department_name;\r\n<\/code><\/pre>\n<ol>\n<li>Classify sales amount using a CASE statement.<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">SELECT<\/span> \r\n    product_name,\r\n    <span class=\"hljs-keyword\">CASE<\/span> \r\n        <span class=\"hljs-keyword\">WHEN<\/span> sales_amount <span class=\"hljs-operator\">&lt;<\/span> <span class=\"hljs-number\">1000<\/span> <span class=\"hljs-keyword\">THEN<\/span> <span class=\"hljs-string\">'Low'<\/span>\r\n        <span class=\"hljs-keyword\">WHEN<\/span> sales_amount <span class=\"hljs-operator\">&gt;=<\/span> <span class=\"hljs-number\">1000<\/span> <span class=\"hljs-keyword\">AND<\/span> sales_amount <span class=\"hljs-operator\">&lt;<\/span> <span class=\"hljs-number\">5000<\/span> <span class=\"hljs-keyword\">THEN<\/span> <span class=\"hljs-string\">'Medium'<\/span>\r\n        <span class=\"hljs-keyword\">ELSE<\/span> <span class=\"hljs-string\">'High'<\/span>\r\n    <span class=\"hljs-keyword\">END<\/span> <span class=\"hljs-keyword\">AS<\/span> sales_category\r\n<span class=\"hljs-keyword\">FROM<\/span> sales;\r\n<\/code><\/pre>\n<p>These examples demonstrate how to use complex queries and subqueries in Hive to manipulate data. By combining various querying techniques, you can perform a variety of complex data analysis and processing tasks.<\/p>\n<p>&nbsp;<\/p>\n<p>More tutorials<\/p>\n<p><a class=\"LinkSuggestion__Link-sc-1gewdgc-4 cLBplk\" href=\"https:\/\/www.silicloud.com\/blog\/how-to-perform-a-join-operation-in-hive\/\" target=\"_blank\" rel=\"noopener\">How to perform a JOIN operation in Hive?<span class=\"sc-gswNZR eASTkv\">(Opens in a new browser tab)<\/span><\/a><\/p>\n<p><a class=\"LinkSuggestion__Link-sc-1gewdgc-4 cLBplk\" href=\"https:\/\/www.silicloud.com\/blog\/2206-2\/\" target=\"_blank\" rel=\"noopener\">What is the execution process of MapReduce tasks in Hive<span class=\"sc-gswNZR eASTkv\">(Opens in a new browser tab)<\/span><\/a><\/p>\n<p><a class=\"LinkSuggestion__Link-sc-1gewdgc-4 cLBplk\" href=\"https:\/\/www.silicloud.com\/blog\/how-can-mybatis-return-fields-from-multiple-tables\/\" target=\"_blank\" rel=\"noopener\">How can Mybatis return fields from multiple tables?<span class=\"sc-gswNZR eASTkv\">(Opens in a new browser tab)<\/span><\/a><\/p>\n<p><a class=\"LinkSuggestion__Link-sc-1gewdgc-4 cLBplk\" href=\"https:\/\/www.silicloud.com\/blog\/commonly-asked-questions-and-answers-for-hibernate-interviews\/\" target=\"_blank\" rel=\"noopener\">Commonly asked questions and answers for Hibernate interviews<span class=\"sc-gswNZR eASTkv\">(Opens in a new browser tab)<\/span><\/a><\/p>\n<p><a class=\"LinkSuggestion__Link-sc-1gewdgc-4 cLBplk\" href=\"https:\/\/www.silicloud.com\/blog\/joining-a-list-in-python\/\" target=\"_blank\" rel=\"noopener\">Joining a list in Python<span class=\"sc-gswNZR eASTkv\">(Opens in a new browser tab)<\/span><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Executing complex queries and subqueries in Hive can be achieved by using the HiveQL language. HiveQL is similar to SQL and can be used to write complex query statements. Here are some examples of complex queries and subqueries. Find the name of the product with the highest sales using a subquery. SELECT product_name FROM products [&hellip;]<\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-2210","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>How to carry out complex queries and subqueries in Hive - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"Executing complex queries and subqueries in Hive can be achieved by using the HiveQL language. 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