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This error happened because the foreign key (type) in [user table] is different from the primary key (type) in the [colors table]. To solve this problem, you should change the primary key in the [colors table]:
ALTER TABLE child_table_name ADD FOREIGN KEY (child_table_column) REFERENCES parent_table_name(parent_table_column); child_table_name is that table in which we want to add constraint. child_table_column is that table column in which we want to add foreign key.
8 gru 2021 · The MySQL ERROR 1452 happens when you try to execute a data manipulation query into a table that has one or more failing foreign key constraints. The cause of this error is the values you’re trying to put into the table are not available in the referencing (parent) table.
25 sty 2024 · Frequently, the error is caused by a mismatch between data types or column sizes of the primary key in the parent table and the foreign key in the child table. Ensuring consistency in data types and sizes can fix the error. Review the table structure to confirm matching data types.
13 lis 2021 · You can change the engine of your MySQL table by using the ALTER TABLE statement as follows: ALTERTABLEcitiesENGINE=InnoDB; Once you altered the table engine, you can try to add the foreign key constraint to the new table again.
6 kwi 2017 · How to fix: Modify the child table DDL so that it matches the character set and collation of the parent table/column (or ALTER the parent table to match the child’s wanted definition. Example: MySQL
The essential syntax for a defining a foreign key constraint in a CREATE TABLE or ALTER TABLE statement includes the following: [CONSTRAINT [symbol]] FOREIGN KEY. [index_name] (col_name, ...) REFERENCES tbl_name (col_name,...) [ON DELETE reference_option] [ON UPDATE reference_option] reference_option:
