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(errno: 150 "Foreign key constraint is incorrectly formed")

YOU.com answered on September 12, 2023 Popularity 9/10 Helpfulness 2/10

answer (errno: 150 "Foreign key constraint is incorrectly formed")

related errno: 150 "Foreign key constraint is incorrectly formed"

(errno: 150 "Foreign key constraint is incorrectly formed")

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-- Possible cause:
-- This error usually occurs when trying to create or alter a foreign key constraint in a database table, and the referenced key does not exist or is incorrectly defined.

-- Solution:
-- 1. Ensure that the referenced key exists in the referenced table.
-- 2. Check the data types of the columns involved in the foreign key constraint. They should match exactly.
-- 3. Make sure the referenced column(s) have an index or a primary key constraint on them.
-- 4. Ensure that the order of the columns is the same between the referencing and referenced tables.
-- 5. If you are using migration tools like Laravel's migrations, check your migration files for any inconsistencies.

-- Example of a correct foreign key constraint creation:
ALTER TABLE referencing_table
ADD CONSTRAINT fk_referencing_table_referenced_table
FOREIGN KEY (referencing_column)
REFERENCES referenced_table(referenced_column);

Popularity 9/10 Helpfulness 2/10 Language sql

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Contributed on Sep 12 2023

YOU.com

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errno: 150 "Foreign key constraint is incorrectly formed"

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-- Example code for creating a foreign key constraint in MySQL

-- Create the primary table
CREATE TABLE users (
  id INT PRIMARY KEY,
  username VARCHAR(50),
  -- Other columns...
);

-- Create the referenced table
CREATE TABLE orders (
  id INT PRIMARY KEY,
  user_id INT,
  -- Other columns...

  -- Define foreign key constraint
  FOREIGN KEY (user_id) REFERENCES users(id)
);

Popularity 9/10 Helpfulness 2/10 Language sql

Source: Grepper

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Contributed on Sep 12 2023

YOU.com

0 Answers Avg Quality 2/10

(errno: 150 "Foreign key constraint is incorrectly formed")

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errno: 150 "Foreign key constraint is incorrectly formed"

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