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I have a large number products that I need to move or copy to other categories in Magento 1.9.1.1. How is this possible?

Is this also possible through database? If it is, which table(s) should modified?

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Try this, Before that take a Backup

You can achieve this easily using a MySQL query.

As per as my suggestion this is the best way.

Magento saves product-category associations in the catalog_category_product table.

Steps

Step 1: Take a backup of the database. Mainly the catalog_category_product table.

Step 2: Run the below query for moving products from the old category to the new category.

SELECT {NEW_CAT_ID} cat, product_id, position FROM catalog_category_product WHERE category_id= {OLD_CAT_ID} AND product_id NOT IN ( SELECT product_id FROM catalog_category_product WHERE category_id = {NEW_CAT_ID}));

Suppose, your new category id is 7, and the old category id is 4.

INSERT INTO catalog_category_product(

    SELECT 7 cat, `product_id`, `position`
    FROM catalog_category_product
    WHERE `category_id` = 4
    AND product_id NOT IN
    (
        SELECT  `product_id`
        FROM catalog_category_product
        WHERE category_id = 7
    )
);

Step 3: Delete records from the old category using a MySQL query:

Delete from catalog_category_product where category_id={OLD_CAT_ID};

Example:

Delete from catalog_category_product where category_id=4;
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