SQL将两个表合并到一个表中，每个表后面都有重复的不同值

我试图将两个表合并起来，在每个不同的用户旁边列出所有可用的产品。因此，对于每个不同的用户，产品都会重复。如果有2个用户和3个产品，则该表将有6行长

表A

select user from users group by user;

user 
u_1
u_2

表B

select product from products group by product;

user 
p_1
p_2
p_3

期望输出

user  product
u_1   p_1
u_1   p_2
u_1   p_3
u_2   p_1
u_2   p_2
u_2   p_3

以下是我迄今为止的代码：

select a.user, b.product from (select user from users group by user) a
(select product from products group by product) b;

---

只需使用笛卡尔连接，如下所示：

SELECT users.user, products.product FROM users, products ORDER BY users.user ASC;

---

它将生成每个用户和组组合的结果。

您在查询中忘记了逗号

MySQL 5.6架构设置：

CREATE TABLE `users`
(
  user VARCHAR(255)
);

CREATE TABLE `products`
(
  product VARCHAR(255)
);

INSERT INTO `users` VALUES ('u_1'), ('u_2');

INSERT INTO `products` VALUES ('p_1'), ('p_2'), ('p_3');

SELECT * FROM `users`, `products` ORDER BY `user` ASC

| user | product |
|------|---------|
|  u_1 |     p_1 |
|  u_1 |     p_2 |
|  u_1 |     p_3 |
|  u_2 |     p_1 |
|  u_2 |     p_2 |
|  u_2 |     p_3 |

查询1：

CREATE TABLE `users`
(
  user VARCHAR(255)
);

CREATE TABLE `products`
(
  product VARCHAR(255)
);

INSERT INTO `users` VALUES ('u_1'), ('u_2');

INSERT INTO `products` VALUES ('p_1'), ('p_2'), ('p_3');

SELECT * FROM `users`, `products` ORDER BY `user` ASC

| user | product |
|------|---------|
|  u_1 |     p_1 |
|  u_1 |     p_2 |
|  u_1 |     p_3 |
|  u_2 |     p_1 |
|  u_2 |     p_2 |
|  u_2 |     p_3 |

：

CREATE TABLE `users`
(
  user VARCHAR(255)
);

CREATE TABLE `products`
(
  product VARCHAR(255)
);

INSERT INTO `users` VALUES ('u_1'), ('u_2');

INSERT INTO `products` VALUES ('p_1'), ('p_2'), ('p_3');

SELECT * FROM `users`, `products` ORDER BY `user` ASC

| user | product |
|------|---------|
|  u_1 |     p_1 |
|  u_1 |     p_2 |
|  u_1 |     p_3 |
|  u_2 |     p_1 |
|  u_2 |     p_2 |
|  u_2 |     p_3 |

使用

（符合建议的ANSI-92标准，而不是使用包含逗号的ANSI-89标准来分隔SQL语句中的表名）：