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magento 2 add foreign key
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| ->addForeignKey( | |
| $installer->getFkName($tableName, COLUMN_NAME, $tableNameFkName, COLUMNFK_NAME), | |
| COLUMN_NAME, //column has to be UNSIGNED if the foreign column is | |
| $installer->getTable($tableNameFkName), | |
| COLUMNFK_NAME, | |
| \Magento\Framework\DB\Ddl\Table::ACTION_CASCADE | |
| ) | |
| ; |
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column has to be UNSIGNED if the foreign column is