插入外键连接的表的查询

Question

Suppose I have following two tables with linked in foreign key address. Assume a person can have different address. So the table structure looks like following where for instance person aa have two addresses.

table A

id name age adress
-------------------
1  aa   bb  10
2  xx   cc  11 

table B

id adress lane1 lane2 lane3 
----------------------------
1  10     l2    l2    l3
2  10     v1    v2    v3

Please tell me how to write the sql insert statement where i can cover the scenario which person aa have two address. (insert statement for populate data as i show in above tables)

Answer 1

When you have circular foreign keys you need what PostgreSQL calls deferred constraints don't know if mysql has these. But it is also a sign of bad schema design.

Better structure would be:

table person

id name age

1  aa   bb
2  xx   cc

table address

id person lane1 lane2 lane3 
1  1     l2    l2    l3
2  1     v1    v2    v3

Then you will need only one foreign-key and the inserts shouldn't give you any trouble.