如何借助关键字 JOIN 编写 MySQL 交叉连接查询？

mysql> Select * from tbl_1;
+----+--------+
| Id | Name   |
+----+--------+
| 1  | Gaurav |
| 2  | Rahul  |
| 3  | Raman  |
| 4  | Aarav  |
+----+--------+
4 rows in set (0.00 sec)

mysql> Select * from tbl_2;
+----+---------+
| Id | Name    |
+----+---------+
| A  | Aarav   |
| B  | Mohan   |
| C  | Jai     |
| D  | Harshit |
+----+---------+
4 rows in set (0.00 sec)

mysql> Select tbl_1.id,tbl_2.id FROM tbl_1 JOIN tbl_2;
+----+----+
| id | id |
+----+----+
| 1  | A  |
| 2  | A  |
| 3  | A  |
| 4  | A  |
| 1  | B  |
| 2  | B  |
| 3  | B  |
| 4  | B  |
| 1  | C  |
| 2  | C  |
| 3  | C  |
| 4  | C  |
| 1  | D  |
| 2  | D  |
| 3  | D  |
| 4  | D  |
+----+----+
16 rows in set (0.00 sec)