MariaDB - Create many to many relationship table between two entities [duplicate] - mysql

Question

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MySQL Creating tables with Foreign Keys giving errno: 150
(20 answers)
Closed 3 years ago.
I am having a problem creating a many to many relationship table in MariaDB.
I have tried using the workbench, manual creation scripts and the "Show Create Table xxxxxxx;" from another already created n to n tables but the result is always the same, the following error:
Error Code: 1005. Can't create table `asi_234_api_establecimientos`.`oe_modalidad` (errno: 150 "Foreign key constraint is incorrectly formed")
The code I am using to create the table:
CREATE TABLE `oe_modalidad` (
`oferta_establecimiento_id` bigint(20) NOT NULL,
`modalidad_id` bigint(20) NOT NULL,
KEY `fk_oe_modalidades_oferta_establecimiento1_idx` (`oferta_establecimiento_id`),
KEY `fk_oe_modalidad_modalidad1_idx` (`modalidad_id`),
CONSTRAINT `fk_oe_modalidad_modalidad1` FOREIGN KEY (`modalidad_id`) REFERENCES `modalidad` (`id`) ON DELETE NO ACTION ON UPDATE NO ACTION,
CONSTRAINT `fk_oe_modalidades_oferta_establecimiento1` FOREIGN KEY (`oferta_establecimiento_id`) REFERENCES `oferta_establecimiento` (`id`) ON DELETE NO ACTION ON UPDATE NO ACTION
) ENGINE=InnoDB
I have tried running this in two different versions of MariaDB, 10.0.38 and 5.5.60 but I keep getting the same error.

Answer 1

This is a very short example:
create table Table1(
id int auto_increment key,
name varchar(50) not null
);
create table Table2(
id int auto_increment key,
name varchar(50) not null
);
create table Table3(
idTable1 int not null,
idTable2 int not null,
primary key(idTable1, idTable2),
CONSTRAINT fk_table3_table1 foreign key (idTable1) references Table1 (id),
CONSTRAINT fk_table3_table2 foreign key (idTable2) references Table2 (id)
);
And remember, Table1 and Table2 primary key have to be same type of Table3 foreign key.