foreign key constraint fails when drop table from database

Question

I've created 3 tables using the query bellow. But when I try to drop the LOANACCOUNT table I receive an error:

Error:

Error Code: 1217. Cannot delete or update a parent row: a foreign key constraint fails

Create tables queries:

CREATE TABLE LOANACCOUNT
(
    ID INT UNSIGNED NOT NULL AUTO_INCREMENT,
    LOANACCOUNTTYPE VARCHAR(9) NOT NULL,
    CREATIONDATE DATE NOT NULL,
    CONSTRAINT LOAN_ACCOUNT_PK PRIMARY KEY (ID),
);

CREATE TABLE TRANSACTIONS
(
    ID INT UNSIGNED NOT NULL AUTO_INCREMENT,
    ACCOUNTID INT UNSIGNED NOT NULL,
    TRANSACTIONTYPE VARCHAR(12) NOT NULL,
    CONSTRAINT TRANSACTION_PK PRIMARY KEY (ID),
    FOREIGN KEY LOANACCOUNT_FK (ACCOUNTID) REFERENCES LOANACCOUNT (ID) ON DELETE CASCADE
);

CREATE TABLE INSTALLMENT
(
    ID INT UNSIGNED NOT NULL AUTO_INCREMENT,
    ACCOUNTID INT UNSIGNED NOT NULL,
    DUEDATE DATE NOT NULL,
    CONSTRAINT INSTALLMENT_PK PRIMARY KEY (ID),
    FOREIGN KEY LOANACCOUNT_FK (ACCOUNTID) REFERENCES LOANACCOUNT (ID) ON DELETE CASCADE
);

Drop table query:

DROP TABLE IF EXISTS LOANACCOUNT;

I know that there is something wrong with my foreign keys, but I don't know how to fix it.

Answer 1

As @Rigg Suggested need to drop other table before dropping LOANACCOUNT .

(ie) Parent table can't be drop unless there is no child linked.

For time being you can disable foreign key check and then drop those tables.

SET SESSION foreign_key_checks = 0;
DROP TABLE IF EXISTS LOANACCOUNT;
SET SESSION foreign_key_checks = 1;