What is the use of hook_update_n? How drupal knows the last schema details?
Answer / Priyanka Kumari
Hook_update_N in Drupal is a customizable update hook that allows developers to create or modify database tables, add or remove data, and run other necessary tasks during an update or installation process. When upgrading a Drupal site, Drupal uses the latest available .install files (hook_schema() function) along with hook_update_N functions to perform any necessary schema changes and updates. Drupal stores information about the last executed update in the 'updates' table, allowing it to determine which update functions should be run during an upgrade.
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