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after upgarde getting this error Integrity constraint violation: 1452 Cannot add or update a child row: a foreign key constraint fails (au.#sql-40d4_c, CONSTRAINT SALES_ORDER_CUSTOMER_ID_CUSTOMER_ENTITY_

2 Answers 2

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It just simply means that the value for column COLUMN_NAME on table TABLE_NAME1 you are inserting doesn't exist on table TABLE_NAME2

The value "abcdefgh" you are inserting for column COLUMN_NAME does not exist on table youa re trying to inssert.

check your database table

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  • but i am upgrading my magento <constraint xsi:type="foreign" referenceId="SALES_ORDER_CUSTOMER_ID_CUSTOMER_ENTITY_ENTITY_ID" table="sales_order" column="customer_id" referenceTable="customer_entity" referenceColumn="entity_id" onDelete="SET NULL"/>
    – imtiazau
    Commented Oct 30, 2019 at 11:31
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delete from sales_order where customer_id not in (select `entity_id` from `customer_entity`)

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