再帮我创建一个商品数据库,完成以下的所有要求,并用sq|语句实现 1.至少包含5个表,每个表中至少有10条数据,至少2个表有外键.2.使用模式匹配查询,使用top查询,in查询,降序查询,使用count集合函数查询,分组统计查询,使用连接条件的多表查询,比较运算符的子查询,使用in的子查询.3.创建视图并使用4.创建索引5.创建唯一性约束,检查约束,默认值约束,外键约束。6.创建一个存储过程并使用7.在某个表中创建一个插入和更新的dml触发器.上面的所有需求都要尽量简单
时间: 2024-03-03 07:50:33 浏览: 70
一条SQL语句查询多个数据库
好的,我会根据您的要求创建一个商品数据库。以下是该数据库的具体实现:
1. 数据库设计:
该数据库包含五个表格,分别为 `product`、`category`、`brand`、`inventory` 和 `order`。其中,`product`表和`category`表有外键关系。
表格结构如下:
```
CREATE TABLE category(
cat_id INT PRIMARY KEY,
cat_name VARCHAR(50) NOT NULL
);
CREATE TABLE brand(
brand_id INT PRIMARY KEY,
brand_name VARCHAR(50) NOT NULL
);
CREATE TABLE product(
prod_id INT PRIMARY KEY,
prod_name VARCHAR(50) NOT NULL,
prod_price FLOAT NOT NULL,
brand_id INT NOT NULL,
cat_id INT NOT NULL,
FOREIGN KEY (brand_id) REFERENCES brand(brand_id),
FOREIGN KEY (cat_id) REFERENCES category(cat_id)
);
CREATE TABLE inventory(
inv_id INT PRIMARY KEY,
prod_id INT NOT NULL,
inv_qty INT NOT NULL,
FOREIGN KEY (prod_id) REFERENCES product(prod_id)
);
CREATE TABLE order(
order_id INT PRIMARY KEY,
order_date DATE NOT NULL,
order_qty INT NOT NULL,
prod_id INT NOT NULL,
FOREIGN KEY (prod_id) REFERENCES product(prod_id)
);
```
2. SQL查询:
使用模式匹配查询:
```
SELECT * FROM product WHERE prod_name LIKE '%iPhone%';
```
使用top查询:
```
SELECT TOP 5 * FROM product ORDER BY prod_price DESC;
```
in查询:
```
SELECT * FROM product WHERE brand_id IN (1, 2);
```
降序查询:
```
SELECT * FROM product ORDER BY prod_price DESC;
```
使用count集合函数查询:
```
SELECT COUNT(*) FROM product WHERE cat_id = 1;
```
分组统计查询:
```
SELECT cat_name, COUNT(*) FROM product JOIN category ON product.cat_id = category.cat_id GROUP BY cat_name;
```
使用连接条件的多表查询:
```
SELECT * FROM product JOIN brand ON product.brand_id = brand.brand_id;
```
比较运算符的子查询:
```
SELECT * FROM product WHERE prod_price > (SELECT AVG(prod_price) FROM product);
```
使用in的子查询:
```
SELECT * FROM product WHERE brand_id IN (SELECT brand_id FROM brand WHERE brand_name = 'Apple');
```
3. 创建视图并使用:
```
CREATE VIEW product_info AS
SELECT prod_name, prod_price, brand_name, cat_name FROM product JOIN brand ON product.brand_id = brand.brand_id JOIN category ON product.cat_id = category.cat_id;
SELECT * FROM product_info WHERE brand_name = 'Apple';
```
4. 创建索引:
```
CREATE INDEX prod_id_index ON product(prod_id);
```
5. 创建唯一性约束,检查约束,默认值约束,外键约束:
唯一性约束:
```
ALTER TABLE brand ADD CONSTRAINT unique_brand_name UNIQUE (brand_name);
```
检查约束:
```
ALTER TABLE product ADD CONSTRAINT check_price CHECK (prod_price > 0);
```
默认值约束:
```
ALTER TABLE inventory ALTER COLUMN inv_qty SET DEFAULT 0;
```
外键约束:
已经在表格设计中添加了外键约束。
6. 创建一个存储过程并使用:
```
CREATE PROCEDURE update_inventory
@prod_id INT,
@qty INT
AS
BEGIN
UPDATE inventory SET inv_qty = inv_qty + @qty WHERE prod_id = @prod_id;
END;
EXEC update_inventory 1, 10;
```
7. 在某个表中创建一个插入和更新的dml触发器:
```
CREATE TRIGGER update_inventory ON order
AFTER INSERT, UPDATE
AS
BEGIN
DECLARE @prod_id INT, @qty INT;
SELECT @prod_id = prod_id, @qty = order_qty FROM inserted;
EXEC update_inventory @prod_id, @qty;
END;
```
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