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I created an attribute in patch data class, and I created a table cloumn in the patch schema class. I don't know the difference between the two.

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Schema patch is a class in Magento 2 that contains schema modification instructions so you can add, update, or delete columns in any custom table or EAV table. A schema patch contains custom schema modification instructions. These modifications can be complex. It is defined in a <Vendor>/<Module_Name>/Setup/Patch/Schema/<Patch_Name>.php file and implements \Magento\Framework\Setup\Patch\SchemaPatchInterface.

On the other hand, A Data patch is a class that contains data modification instructions. It is defined in a <Vendor>/<Module_Name>/Setup/Patch/Data/<Patch_Name>.php file and implements \Magento\Framework\Setup\Patch\DataPatchInterface.

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