MySQL DELETE çalışmıyor

Question

Sport WHERE SportId = 1'den DELETE;

Yukarıda yürüttüğümde, bu hatayı alıyorum. Lütfen bana yardım et;

DogSport use.Error içinde: SportId = 1 silmek veya bir üst satır güncellenemiyor NEREDE Sport GELEN DELETE: Bir yabancı anahtar kısıtlaması başarısız (. dogsportorders, KISITLAMA orders_ibfk_1 YABANCI KEY (EqId)) equipment (EqId KAYNAKLAR)

/* Creating Sport table */ 
CREATE TABLE Sport(
SportId INT NOT NULL AUTO_INCREMENT, 
SportName VARCHAR(20) NOT NULL, 
Description VARCHAR(200) NOT NULL, 
PRIMARY KEY(SportId) 
); 

/* Inserting values for Sport table */ 
INSERT INTO Sport(SportName,Description) 
VALUES('Agility','This is a fun dog sport which a handler directs a dog through a course of obstacles. Body motion, speed, hand signals are used by the handler to direct the dog.'), 
('Flyball','Energetic and exciting sport which is also called drag racing for dogs'), 
('Disc Dog','This sport is also known as Frisbee dog. The sport involves the bond between the owner and dog, by letting them to work together'), 
('Dog Diving','This sport involves loving run, jumping, and swimming. This is a very popular sport nowadays'), 
('Cani-Cross','This is a sport event which running off-road with dogs. It is an useful sport which keeps the owner and the dog fit by a physical workout and directional commands.'); 

/* Creating UserSport table */ 
CREATE TABLE UserSport(
UserId INT NOT NULL, 
SportId INT NOT NULL, 
PRIMARY KEY(UserId,SportId), 
FOREIGN KEY(UserId) REFERENCES User(UserId) ON DELETE CASCADE, 
FOREIGN KEY(SportId) REFERENCES Sport(SportId) ON DELETE CASCADE 
); 

/* Inserting values for UserSport table */ 
INSERT INTO UserSport(UserId,SportId) 
VALUES(1,2), 
(1,4), 
(1,3), 
(1,5); 

/* Creating Equipment table */ 
CREATE TABLE Equipment(
EqId INT NOT NULL AUTO_INCREMENT, 
EqName VARCHAR(40) NOT NULL, 
Price DECIMAL(9,2) NOT NULL, 
SportId INT NOT NULL, 
PRIMARY KEY(EqId), 
FOREIGN KEY(SportId) REFERENCES Sport(SportId) ON DELETE CASCADE 
); 

/* Inserting values for Equipment table */ 
INSERT INTO Equipment(EqName,Price,SportId) 
VALUES('Wing Jump',6700,1), 
('Tire',4500,1), 
('Open Tunnel',9000,1), 
('Chute',3000,1), 
('Boomerang Flyball Box',6300,2), 
('Training Box',4200,2), 
('Flyball Jumps',7800,2), 
('Can Am Flyball Box',3100,2), 
('Flyball Harness',1800,2), 
('Balance Disc',2000,3), 
('Training Punches',1000,3), 
('Retrieve Water Ring',4500,4), 
('Dive Jacket',3000,4), 
('Aqua Floating Toy',1500,4), 
('Cani-Cross Harness',4000,5), 
('PawZ Dog Boots',1000,5), 
('Custom Shoulder Harness',3000,5); 


/* Creating User table */ 
CREATE TABLE User(
UserId INT NOT NULL AUTO_INCREMENT, 
Title VARCHAR(5) NOT NULL, 
FName VARCHAR(20) NOT NULL, 
LName VARCHAR(20) NOT NULL, 
Email VARCHAR(30) NOT NULL UNIQUE, 
Phone VARCHAR(15), 
Address VARCHAR(30) NOT NULL, 
Password VARCHAR(20) NOT NULL UNIQUE, 
PRIMARY KEY(UserId) 
); 

/* Inserting values for User table */ 
INSERT INTO User(Title,FName,LName,Email,Phone,Address,Password) 
VALUES('Mr.','Raveen','Chandra','admin@dogsport.com','0778547079','Ambalangoda','123'), 
('Miss','Bisma','Ishani','bisma@gmail.com','0785234123','Colombo','456'), 
('Dr','Shantha','Kumara','shantha@yahoo.com','0912374392','Ambalangoda','789'), 
('Ms.','Madusha','Perera','perera@yahoo.com','0782361490','Galle','3235'); 

Answer 1

En az bir tane çocuk masası olmalı, hangisi eksik?

İlk ekipmanın size tüm alt tabloları sağlayacak komuta altında yürütmek fiili

select * from information_schema.KEY_COLUMN_USAGE where TABLE_SCHEMA ='your_db' and REFERENCED_TABLE_NAME ='equipment'; 

Not: db adı ile değişiklik your_db. "Silme basamaklandığında hiçbir eylem"

Sonra ya da alt tablosundan satırları silmek veya ayrıca "Silme basamaklandığında" olmalıdır yerine

temiz bir yol-

değil kısa yol yoktur

Yabancı anahtar kontrollerinizi kapatabilir ve silebilirsiniz, ancak bunu önermeyeceğim.

set foreign_key_checks=0; 
DELETE FROM Sport WHERE SportId=1; 
set foreign_key_checks=1; 

Answer 2

Öncelikle bu tabloya FK sahip diğer tabloları silin ve ancak o zaman ondan silin:

DELETE FROM Equipment WHERE SportId=1; 
DELETE FROM UserSport WHERE SportId=1; 
DELETE FROM Sport WHERE SportId=1;