Question

我应该删除所有订单少于100且居住在黑斯街的客户的所有条目。

由于应从3个表中删除：“客户”表，“订单中的物品”表和“订单”表

CREATE DATABASE dogsLife;
use dogsLife;

CREATE TABLE Items 
(
    ItemID int PRIMARY KEY, 
    ItemDesc varchar(35), 
    stock int,
    cost double
);

CREATE TABLE Clients 
(
    clientID int PRIMARY KEY, 
    clientName varchar(35),
    Street varchar(35)
);

CREATE TABLE Orders 
(
    OrdID int PRIMARY KEY, 
    clientID int,
    OrderDate date,
   FOREIGN KEY (clientID) references Clients(clientID)
);

CREATE TABLE Items_in_orders 
(
    OrdID int,
    ItemID int,
    quantity int,
    FOREIGN KEY (OrdID) references Orders(OrdID),
    FOREIGN KEY (ItemID) references Items(ItemID),
    PRIMARY KEY (OrdID, ItemID)
);

INSERT INTO Items VALUES (1,'skirt',50,100),
(2,'dress',24,300),
(3,'shirt',55,250),
(4,'pants',2,400);

INSERT INTO Clients VALUES (123,'Or','Bilu'),
(345,'Sapir','Even Gvirol'),
(567,'Yael','Aza'),
(789,'Hila','Hess');

INSERT INTO Orders VALUES (2020,123,'2019-04-10'),
(2030,345,'2019-04-11'),
(2040,123,'2019-04-14'),
(2050,345,'2019-04-16'),
(2060,567,'2019-04-16'),
(2070,789,'2019-04-18');

INSERT INTO Items_in_orders VALUES(2020,1,200),
(2020,2,40),
(2020,3,60),
(2030,2,30),
(2030,4,1),
(2040,3,20),
(2050,1,40),
(2060,2,50),
(2070,1,1);

在SQL Q处删除

0 个答案: