MySQL. Can't create table errno 150

Question

I have to create a database with two tables in MySQL, but the script fails with errno 150 (foreign key problem). I double-checked the foreign key fields to be the same on bo

Answer 1

In case somebody is still having problems with this, I tried all the solutions above (except for SET FOREIGN_KEY_CHECKS) and nothing worked. The problem was that when you reference the first table, some databases are case sensitive about the table names. I think this is weird since I never saw this before on MySQL, Oracle and now this happened for me on MariaDB.

For example:

Create table if not exists CADASTRO_MAQUINAS ( Id VARCHAR(16), Primary Key (Id) );

Create table if not exists INFOS ( Id_Maquina VARCHAR(16) NOT NULL, CONSTRAINT FK_infos_cadastro_maquinas Foreign Key (Id_Maquina) references CADASTRO_MAQUINAS(Id) );

If I try to create the second table using cadastro_maquinas (lower cases) instead of CADASTRO_MAQUINAS, I will receive this error.