Adding data into myadminPhp - mysql

Question

Hey guys so Im trying to add some data into my tables, for some reason the inspection table wouldnt allow to add data to itself. Im uploading it as SQL file because I used mockaroo for dummy data!
/*
-- Use test;
-- Use mysql;
-- Use information_schema;
-- source f:/createempdepttable.sql;
-- Notice the forward slash / in above statement
*/
-- section 13.1.28. MySQL Documentation DROP TABLE Syntax
Drop database if exists g00337857abu;
create database g00337857abu CHARACTER SET utf8 COLLATE UTF8_GENERAL_CI ;
Use g00337857abu;
Show tables;
DROP TABLE IF EXISTS invoice;
CREATE TABLE invoice (
invoice_no int(10) NOT NULL AUTO_INCREMENT,
date date NOT NULL,
PRIMARY KEY(invoice_no)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
DROP TABLE IF EXISTS chauffeurs;
CREATE TABLE chauffeurs (
chauffeur_id int(10) NOT NULL,
fname varchar(20) NOT NULL,
lname varchar(20) NOT NULL,
phone int(15) NOT NULL,
address varchar(20) NOT NULL,
city varchar(15) NOT NULL,
county varchar(15) NOT NULL,
PRIMARY KEY (chauffeur_id)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
DROP TABLE IF EXISTS customers;
CREATE TABLE customers (
customer_id int(50) NOT NULL AUTO_INCREMENT,
fname varchar(20) NOT NULL,
lname varchar(20) NOT NULL,
address varchar(30) NOT NULL,
city varchar(20) NOT NULL,
county ENUM('Armagh','Carlow','Cavan','Clare','Cork','Derry','Donegal','Down','Dublin','Fermanagh','Galway','Kerry','Kildare','Kilkenny','Laois','Leitrim','Limerick','Longford','Louth','Mayo','Meath','Monaghan','Offaly','Roscommon','Sligo','Tipperary','Tyrone','Waterford','Westmeath','Wexford','Wicklow') NOT NULL,
phone int(10) NOT NULL,
email varchar(20) NOT NULL,
payment_method ENUM ('Visa', 'Amex', 'Cash', 'American Express', 'Mastercard') NOT NULL,
status ENUM('Approved','Unapproved'),
driver_no varchar(20),
PRIMARY KEY (customer_id)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
DROP TABLE IF EXISTS mechanics;
CREATE TABLE mechanics (
mechanic_id int(10) NOT NULL AUTO_INCREMENT,
fname varchar(20) NOT NULL,
lname varchar(20) NOT NULL,
PRIMARY KEY (mechanic_id)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
DROP TABLE IF EXISTS vehicles;
CREATE TABLE vehicles (
vehicle_id int(10) NOT NULL AUTO_INCREMENT,
category ENUM('Sedan','Hatchback','SUV', 'Coupe', 'Crossover') NOT NULL,
no_of_seats int(11) NOT NULL,
brand varchar(25) NOT NULL,
model varchar(25) NOT NULL,
product_year int(11) NOT NULL,
rate_per_day int(11) NOT NULL,
PRIMARY KEY (vehicle_id)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
DROP TABLE IF EXISTS inspections;
CREATE TABLE inspections (
inspection_id int(10) NOT NULL AUTO_INCREMENT,
inspection_date date NOT NULL,
vehicle_id int(10) NOT NULL,
problem varchar(50) NOT NULL,
repair varchar(55) NOT NULL,
repair_complete ENUM('Yes','No') NOT NULL,
mechanic_id int(10) NOT NULL,
PRIMARY KEY(inspection_id),
KEY mechanic_idfk1 (mechanic_id),
KEY vehicle_idfk2 (vehicle_id),
CONSTRAINT vehicle_idfk2 FOREIGN KEY (vehicle_id) REFERENCES vehicles (vehicle_id),
CONSTRAINT mechanic_idfk1 FOREIGN KEY (mechanic_id) REFERENCES mechanics (mechanic_id)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
DROP TABLE IF EXISTS payment_details;
CREATE TABLE payment_details (
card_no int(50) NOT NULL AUTO_INCREMENT,
customer_id int(50) NOT NULL,
CVV int(11) NOT NULL,
card_type ENUM('Visa', 'Amex', 'Cash', 'Mastecard') NOT NULL,
expiry_date date NOT NULL,
PRIMARY KEY(card_no),
KEY customer_idfk1 (customer_id),
CONSTRAINT customer_idfk1 FOREIGN KEY (customer_id) REFERENCES customers (customer_id)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
DROP TABLE IF EXISTS vehicle_collections;
CREATE TABLE vehicle_collections (
collection_id int(10) NOT NULL AUTO_INCREMENT,
vehicle_id int(10) NOT NULL,
collection_date date NOT NULL,
return_date date NOT NULL,
mileage_before int(10) NOT NULL,
mileage_after int(10) NOT NULL,
duration int(5) NOT NULL,
PRIMARY KEY (collection_id),
KEY vehicle_idfk1 (vehicle_id),
CONSTRAINT vehicle_idfk1 FOREIGN KEY (vehicle_id) REFERENCES vehicles (vehicle_id)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
DROP TABLE IF EXISTS bookings;
CREATE TABLE bookings (
booking_id int(50) NOT NULL AUTO_INCREMENT,
booking_date date NOT NULL,
start_date date NOT NULL,
end_date date NOT NULL,
invoice_no int(10) NOT NULL,
chauffeur_id int(10)NOT NULL,
vehicle_id int(10) NOT NULL,
customer_id int(50) NOT NULL,
chauffeur_req ENUM('Yes','No') NOT NULL,
PRIMARY KEY (booking_id),
KEY invoice_nofk2 (invoice_no),
KEY chauffeur_idfk1 (chauffeur_id),
KEY customer_idfk2 (customer_id),
KEY vehicle_idfk2 (vehicle_id),
CONSTRAINT invoice_nofk1 FOREIGN KEY (invoice_no) REFERENCES invoice (invoice_no) ON DELETE CASCADE,
CONSTRAINT chauffeur_idfk2 FOREIGN KEY (chauffeur_id) REFERENCES chauffeurs (chauffeur_id)ON DELETE CASCADE,
CONSTRAINT customer_idfk3 FOREIGN KEY (customer_id) REFERENCES customers (customer_id) ON DELETE CASCADE,
CONSTRAINT vehicle_idfk3 FOREIGN KEY (vehicle_id) REFERENCES vehicles (vehicle_id)ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
error in php is as follows:
1452 - Cannot add or update a child row: a foreign key constraint fails (g00337857abu.inspections, CONSTRAINT mechanic_idfk1 FOREIGN KEY (mechanic_id) REFERENCES mechanics (mechanic_id))
could it be because mechanic table isnt yet filled out? I only filled out chauffeurs customers so far and they were fine