MySQL FK syntax: insert column called practice into table cred_insurances that is FK to table practices

I need to insert a column called "practice" into table "cred_insurances" that is a FK referencing table "pr开发者_开发问答actices" PK "id"

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You will need to ensure that your MySQL table is using the InnoDB engine, by running the following from the mysql prompt.

show create table cred_insurances

the output will include (towards the bottom) the text ENGINE=.... If it is not InnodDB, then you will first need to convert it using the following SQL. You may need to do this to the parent table as well.

ALTER TABLE cred_insurances ENGINE=InnoDB

Then you can add a column and a foreign key constraint with the following command:

ALTER TABLE cred_insurances
    ADD practice INT,
    ADD CONSTRAINT fk_practice
    FOREIGN KEY (practice) REFERENCES practices (ID)

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If you are having difficulties with errors whilst adding a foreign key, try the following command to get more detailed information on the error.

SHOW ENGINE INNODB STATUS