Adding two tables with no column in common in MySQL

Question

I have two tables my database. I just want to append these two tables. I am not able to find the solution for it

Table 1 -

 names
    First_name    Last_name
      Navjot        Singh
      Ram            Gopal
      Naveen         Kumar

Table 2 -

address
            address    Pin
             Delhi    90007
             Lucknow  90003
             Mumbai   60008

How to get the data from these two tables in the following format:

First_name      Last_name      address        Pin

  Navjot        Singh            Delhi       90007
  Ram           Gopal           Lucknow     90003
  Naveen        Kumar            Mumbai     60008

These are just sample tables. I want to do this thing on 50,000 rows. Number of rows are same in my both the tables. I have tried cross join. I have tried following sql as well:

Select * from names,address;

It increases the total number of rows. I even tried union, but it did not work.

It is something like cbind.data.frame in R. How to do it in mysql? any help would be appreciated.

Answer 1

The problem is that you have no column for the join. Assuming that you have some column to specify the ordering, you can do:

select t1.*, t2.*
from (select t.*, (@rn := @rn + 1) as seqnum
      from table1 t cross join (select @rn := 0) params
      order by t.id
     ) t1 join
     (select t.*, (@rn2 := @rn2 + 1) as seqnum
      from table2 t cross join (select @rn2 := 0) params
      order by t2.id
     ) t2
     on t1.seqnum = t2.seqnum;

This generates a sequential key for each row in each of the tables. This key is then used for the joins.

Answer 2

There may be an easier way but off the top of my head

Select I.*, j.* from
   (Select *, @row:@row+1 as rowid from names) I
Left join
   (Select *, @adid:@adid+1 as rowid from address) j
Using(rowid);