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How to implement hook_update_n() ?
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Answer / Sumit Chaudhary
Hook_update_n() is used in Drupal for database schema updates. To implement it, create a custom module, and then define the appropriate hook within your module's .module file. The hook should return an array of update operations, each represented as a key-value pair where the key is a unique machine name and the value contains the actual update function.
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