Question

I got two mysql table like this

CREATE  TABLE IF NOT EXISTS tbl1 (
`id` INTEGER(2) UNSIGNED NOT NULL PRIMARY KEY AUTO_INCREMENT ,
`name` VARCHAR(20) NOT NULL
) ENGINE=InnoDB CHARACTER SET utf8 COLLATE utf8_general_ci;

CREATE  TABLE IF NOT EXISTS tbl2 (
`tbl_id` INTEGER(2) UNSIGNED NOT NULL PRIMARY KEY AUTO_INCREMENT ,
`id2` INTEGER(2) UNSIGNED NOT NULL ,
`email` VARCHAR(20) NOT NULL ,
FOREIGN KEY (`id2`) REFERENCES tbl1(`id`)
) ENGINE=InnoDB CHARACTER SET utf8 COLLATE utf8_general_ci;

Here is example data in tbl1

1   hello
2   world
3   happy
4   end

and example data in tbl2

2   1   me@mail
3   2   my@mail
4   4   you@mail

now I want to select name and email joining two table. Here is the sql

select name,email from tbl1 t1,tbl2 t2 where t2.id2 = t1.id;

with it i’m getting

hello   me@mail
world   my@mail
end     you@mail

but I want all row from tbl1

hello   me@mail
world   my@mail
happy   null or nothing or 0
end     you@mail

here i am stuck. any help will be appreciated.
thanks in advance.

Answer 1

You should use a LEFT JOIN:

select name,email 
from tbl1 t1
LEFT JOIN tbl2 t2 
  on t1.id = t2.id2;

See SQL Fiddle with Demo.

Your current query is using an INNER JOIN which will only return the rows that are matching in both tables. The LEFT JOIN will return all records in tbl1 even if there is no matching row in tbl2.

If you need help learning join syntax here is a visual explanation of joins