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I want to reset 1 multiselect attribute for all products.

So remove any value (set to null) for all products and save

Ideally targetting the products that have a value set ... it makes no sense to unset data that is not set

So the logic would be - find all products with at least some data set for 1 multiselect attribute - unset the data - save

question: how can this be done?

thanks

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The simplest way is to delete the data from the database. With that approach you don't need to find products, load and save them.

Multiselect attributes usually have the backend_type = varchar. You can check that for your attribute by running the SQL statement:

select * from eav_attribute where attribute_code = '[YOUR_ATTRIBUTE_CODE]';

If it is a varchar attribute you can delete all values of this attribute for all products by running the following statement:

delete v from catalog_product_entity_varchar v
join  catalog_product_entity p 
  on p.entity_id = v.entity_id
join eav_attribute a 
     on v.attribute_id = a.attribute_id and a.attribute_code = '[YOUR_ATTRIBUTE_CODE]';

If you want to test the statement for a single product first you can simply add where p.sku = '[YOUR SKU] to the statement and it will delete only the values for that product.

I hope that helps.

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