There are two columns in the new table(table1 join table2) which have the same column name, how to get the values of both respectively

Question

select * from table1 join table2 on table1.column3=table2.column4 where ...
...
$row=mysql_fetch_assoc($result);

However, there are two columns in the

Answer 1

When there's a column name collision due to a query joining 2+ tables, you can not use *. You can use:

SELECT table_1.*, 
       table_2.*
  FROM table_1, 
       table_2

If that doesn't return the list of columns you want, you will have to explicitly list every column. There's no way around - it's an all or nothing deal.

Table Aliases

...but typing out the full table name every time can be a pain, which is why you can alias tables:

SELECT t1.*, 
       t2.*
  FROM table_1 AS t1, 
       table_2 t2

Either alias notation is supported. They're also required if you want to join a table to itself.