sql - Joining tables back to themselves in MySql -


let's have 3 tables:

user table:

create table `user` (   `id` int(11) unsigned not null auto_increment,   `name` varchar(50) default null,   `loc` int(11) default null,   `doc` int(11) default null,   primary key (`id`) ) engine=myisam auto_increment=3 default charset=latin1; 

location table:

create table `location` (   `id` int(11) unsigned not null auto_increment,   `name` varchar(50) default null,   primary key (`id`) ) engine=myisam auto_increment=4 default charset=latin1; 

and document table:

create table `document` (   `id` int(11) unsigned not null auto_increment,   `maintainer` int(11) default null,   primary key (`id`) ) engine=myisam auto_increment=2 default charset=latin1; 

i can pull user info , it's corresponding location , document info following query:

select * `user` left join `location` on user.loc = location.id left join `document` on user.doc = document.id; 

the location info referenced information doesn't refer other rows in other tables. document table, however, contains maintainer field directly corresponds user in user table. field encapsulates user information, , not give me actual user data.

is there not way of querying tables such data maintainer returns actual user data opposed id?

select     u.name user_name,     m.name maintainer_name,     l.name location_name user u     left outer join document d on d.id = u.doc     left outer join user m on m.id = d.maintainer     left outer join location l on l.id = u.loc 

Comments

Popular posts from this blog

css - Which browser returns the correct result for getBoundingClientRect of an SVG element? -

gcc - Calling fftR4() in c from assembly -

Function that returns a formatted array in VBA -