MySQL将两个表连接到n：m关系

Question

I have two tables (Table 1 and Table 2) and I want to create a table (Table 3) with the ID's. So to speak an to m relationship table.

Table 1
1 Mark
2 George
3 David

Table 2
5 Bank
6 Construction
7 Carfactory

Table 3
1 5
1 6
1 7
2 5
2 6
2 7
3 5
3 6
3 7

I can make it so that the rows from table 1 are taken from 1 to 3 but not as to the row 1 all rows are taken from the table 2. Can anyone help me ?

Answer 1

您可以使用CROSS JOIN实现预期的输出。

SELECT table1.id,table2.id FROM table1 CROSS JOIN table2