{"id":11897,"date":"2024-03-14T14:55:41","date_gmt":"2024-03-14T14:55:41","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/what-is-the-usage-of-the-lag-function-in-hive\/"},"modified":"2025-08-04T18:35:59","modified_gmt":"2025-08-04T18:35:59","slug":"what-is-the-usage-of-the-lag-function-in-hive","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/what-is-the-usage-of-the-lag-function-in-hive\/","title":{"rendered":"Hive LAG Function: Usage &#038; Examples"},"content":{"rendered":"<p>In Hive, the LAG function is used to retrieve the value of a specific column from the previous row. The function takes three parameters: the column name to query, the offset to search for (i.e. the number of rows to retrieve, default is 1), and an optional default value to return if the previous row is not found. Here is the basic syntax of the LAG function:<\/p>\n<pre class=\"post-pre\"><code>LAG(column_name, offset, default_value) OVER (PARTITION BY partition_col ORDER BY order_col)\r\n<\/code><\/pre>\n<p>Among them, column_name represents the column to be queried, offset represents the offset of the number of rows to be obtained, and default_value represents an optional default value. The PARTITION BY clause is used to specify the partition column, and the ORDER BY clause is used to specify the sorting column.<\/p>\n<p>Here is an example using the LAG function:<\/p>\n<pre class=\"post-pre\"><code>SELECT \r\n  id,\r\n  revenue,\r\n  LAG(revenue, 1, 0) OVER (ORDER BY id) AS previous_revenue\r\nFROM \r\n  sales_data;\r\n<\/code><\/pre>\n<p>In this example, we queried a sales_data table to retrieve the values of the revenue column for each row, and used the LAG function to obtain the revenue value of the previous row. If the previous row does not exist (i.e. the current row is the first row), it returns the default value of 0.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In Hive, the LAG function is used to retrieve the value of a specific column from the previous row. The function takes three parameters: the column name to query, the offset to search for (i.e. the number of rows to retrieve, default is 1), and an optional default value to return if the previous row [&hellip;]<\/p>\n","protected":false},"author":11,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","footnotes":""},"categories":[1],"tags":[301,3885,335,765,5946],"class_list":["post-11897","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-hadoop","tag-hiveql","tag-lag-function","tag-sql-functions","tag-window-functions"],"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>Hive LAG Function: Usage &amp; Examples - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"Learn Hive LAG function to access previous row values. 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