{"id":13125,"date":"2024-03-15T01:56:40","date_gmt":"2024-03-15T01:56:40","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/how-is-the-lag-function-used-in-mysql\/"},"modified":"2025-08-05T11:46:15","modified_gmt":"2025-08-05T11:46:15","slug":"how-is-the-lag-function-used-in-mysql","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/how-is-the-lag-function-used-in-mysql\/","title":{"rendered":"MySQL LAG Function: Usage & Syntax"},"content":{"rendered":"

The LAG function is a window function in MySQL that is used to retrieve data from a specified number of rows before the current row.<\/p>\n

The syntax of the LAG function is as follows: LAG(expression, offset, default) OVER (PARTITION BY partition_expression ORDER BY sort_expression)<\/p>\n

Description of Parameters:<\/p>\n

    \n
  1. the column or expression that needs to be obtained.<\/li>\n
  2. Number of rows to retrieve, which can be a positive, negative, or zero value. Positive numbers indicate fetching rows before the current row, negative numbers indicate fetching rows after the current row, and zero indicates fetching the current row.<\/li>\n
  3. optional parameter that specifies the default value to return when the requested row does not exist.<\/li>\n<\/ol>\n

    The LAG function can be used to achieve various functions, such as:<\/p>\n

      \n
    1. Retrieve the data from the previous line.<\/li>\n
    2. Calculate the difference between the current row and the previous row.<\/li>\n
    3. Get data from the previous few rows before the current row.<\/li>\n
    4. Calculate the aggregate value of the current row and the data from the previous few rows.<\/li>\n<\/ol>\n

      Here is an example using the LAG function:<\/p>\n

      SELECT \r\n  id, \r\n  value, \r\n  LAG(value, 1, 0) OVER (ORDER BY id) AS lag_value \r\nFROM \r\n  table_name;\r\n<\/code><\/pre>\n
      In this example, the LAG function is used to retrieve data from the previous row and return the result in a new column called “lag_value”.<\/p>\n","protected":false},"excerpt":{"rendered":"
      The LAG function is a window function in MySQL that is used to retrieve data from a specified number of rows before the current row. The syntax of the LAG function is as follows: LAG(expression, offset, default) OVER (PARTITION BY partition_expression ORDER BY sort_expression) Description of Parameters: the column or expression that needs to be […]<\/p>\n","protected":false},"author":7,"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":[766,17397,796,765,17398],"class_list":["post-13125","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-database-queries","tag-mysql-lag-function","tag-mysql-tutorial","tag-sql-functions","tag-window-functions-mysql"],"yoast_head":"\nMySQL LAG Function: Usage & Syntax - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"Learn how to use MySQL LAG function to retrieve data from previous rows. 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