如何将具有相似列的两个表联接到一个表中

Question

I have 3 tables, A and B and C.

sample data for Table A

nid   tid
101    3
101    4
101    7
103    3
103    5
104    2
104    4
104    7

sample data for Table B

tid   name
2     ram
3     shyam
4     krishna
5     shiv
7     narad

What I want is, in a Third Table C

id   nid   labels
1    101   shyam, krishna, narad
2    103   shyam, shiv
3    104   ram, krishna, narad

I know how to do this with PHP, but is there any way to do this mysql alone?

Both tables (A and B) have thousands of records and don't have any unique column at the moment.

I tried GROUP_CONCAT but I could not construct desired output.

Edit 1 - I forgot to mention that Table C already has id and nid column inserted, while labels column is empty. So I need help in constructing some query which can update all records of Table C with labels mentioned as above.

Thanks. Regards,

Answer 1

This will insert the records on TableC . Since ID is an autogenerated column, you can omit this in the INSERT clause.

INSERT INTO TableC(Nid, Labels)
SELECT  a.nid, GROUP_CONCAT(b.Name) Labels
FROM    TableA a
        INNER JOIN TableB b
            ON a.tid = b.tid
GROUP   BY a.nid