MySQL #1005 can't create table, but don't says why, errno:150

Question

I'm making a database, with several tables, and so far I could make the tables, and update it with some demo data, but when a tried to make a new table for connecting two of my tables I just get this can't create table error whatever I did. Tried to rename the entities to an entirely different name maybe that's the problem but it wasn't.

CREATE DATABASE IF NOT EXISTS ETR;

CREATE TABLE Hallgato (
OktAzonosito INT(6) PRIMARY KEY,
EHAazonosito VARCHAR(11),
TeljesNev VARCHAR(50),
Szemelyazonosito INT(6),
AnyaNyelv VARCHAR(20),
VegzettsegSzint VARCHAR(25),
AnyjaNeve VARCHAR(35),
SzuletesiHely VARCHAR(30),
SzuletesiEv DATE,
Allampolgarsag VARCHAR(30),
Neme VARCHAR(5),
Adoazonosito INT(6),
TAJszam INT(6),
BankszamlaSzam INT(9)
) ENGINE = InnoDB;

CREATE TABLE OktAdat (
OktAzonosito INT(6),
NyelvVizsgaNyelve VARCHAR(15),
NyVegzesDatuma DATE,
NyIntezmeny VARCHAR(35),
EgyebVegzetteseg VARCHAR(15),
EgyVegzesDatuma DATE,
ID INT(5) PRIMARY KEY NOT NULL auto_increment,
FOREIGN KEY (OktAzonosito) REFERENCES Hallgato(OktAzonosito) ON DELETE CASCADE
) ENGINE = InnoDB;

CREATE TABLE Oktato (
TEHAazonosito VARCHAR(11) PRIMARY KEY,
Nev VARCHAR(50),
SzuletesiEv DATE,
Szakterulet VARCHAR(25),
Telefonszam INT(9),
Email VARCHAR(50)
) ENGINE = InnoDB;

CREATE TABLE Kurzus (
KurzusKod VARCHAR(8) PRIMARY KEY,
KurzusNev VARCHAR(30),
Idotartam INT(3),
EloadasHelye VARCHAR(25),
Tipus CHAR(3),
Vizsgatipus VARCHAR(7),
KreditErtek INT(2),
OktatoKod VARCHAR(11)
) ENGINE = InnoDB;

CREATE TABLE Terem (
Sorszam INT(3) PRIMARY KEY NOT NULL,
Epuletszam INT(1),
Kapacitas INT(3),
IRszam INT(4),
Utca CHAR(25),
Hazszam INT(2)
) ENGINE = InnoDB;

CREATE TABLE DiakKurz (
kd_id INT (5) PRIMARY KEY NOT NULL auto_increment,
DKKod VARCHAR(8),
EHA VARCHAR(11),
FOREIGN KEY (EHA) REFERENCES Hallgato(EHAazonosito) ON DELETE CASCADE,
FOREIGN KEY (DKKod) REFERENCES Kurzus(KurzusKod) ON DELETE CASCADE
) ENGINE = InnoDB;

The problem is with creating the DiakKurz table.

Answer 1

You'll have to set an INDEX for column EHAazonosito in table Hallgato

CREATE TABLE Hallgato (
OktAzonosito INT(6) PRIMARY KEY,
EHAazonosito VARCHAR(11), INDEX (EHAazonosito),
TeljesNev VARCHAR(50),
Szemelyazonosito INT(6),
AnyaNyelv VARCHAR(20),
VegzettsegSzint VARCHAR(25),
AnyjaNeve VARCHAR(35),
SzuletesiHely VARCHAR(30),
SzuletesiEv DATE,
Allampolgarsag VARCHAR(30),
Neme VARCHAR(5),
Adoazonosito INT(6),
TAJszam INT(6),
BankszamlaSzam INT(9)
) ENGINE = InnoDB;