php - Combining Three Tables Output using another to cross-reference -


background

being mysql n00b am, best query can come match 3 tables, run comparison between 2 tables, output variable, , use variable select final output cross reference table. after that, run yet query output third table...

now know there way select rows needed 1 single statement, life of me cannot piece together. can please me structure query need correctly?

i must output result set in php using information 3 tables, , use separate 1 actual link between 2 table's ids. thank you!!

tables

name: table_one ----------------------------------------------------------- id | user_id | o_id | num | likes | dislikes | .... | ... | -----------------------------------------------------------  1 | 765     | 1    | 100 |android| cats                  |  2 | 765     | 2    | 100 | birds | mysql queries         |  3 | 765     | 3    | 100 | php   | iphones               |  4 | 765     | 2    |  2  |oranges| bananas               | -----------------------------------------------------------  name: table_two                             ------------------------------------------------------------| id |first_name| location | num_times | diploma | why        | ------------------------------------------------------------| 1 | abc     | here     | 0         | none    | because      | 2 | bcd     | there    | 5         | bs      | no reason    | 3 | sally   |  | 194384    | dr      | no reason    | 4 | jack    | overthere| 3         | none    | failure      | 5 | bob     | mars     | 0         | random  | in training  | -------------------------------------------------------------  name: table_agency         | ---------------------------| id | name | address        |  ---------------------------| 1  |    | 123x           |  2  | b    | 234y           |  3  | c    | 456z           |  ---------------------------- name: table_link  -----------------------------           rel_a | rel_b            ---------------------------------            1   |    1            |            1   |    4            |            1   |    5            |            2   |    1            |            2   |    4            |            2   |    5            |            3   |    2            |            3   |    3            |            4   |    3            | ---------------------------------

output/php

$results = $class->runquery($query);    //basically fetchall foreach ($results $result) {  echo id_table_one ($result['id']);               echo $result['name']; echo $result['num']; echo $result['likes']; echo other_rows...basically table_one.* echo all_first_names&num_times correspond in table link; }      //actual printout(echo doesn't have ,'s):     //here should output:  ------------------------------------------------- 1 |     | 100  | android  | abc-0/jack-3/bob-0| 2 | b     | 100  | birds    | abc-0/jack-3/bob-0| 3 | c     | 100  | php      | bcd-5/sally-194384| 4 | b     | 2    | oranges  | sally-194384      | ----------------------------------------------

side notes

1) there @ least 1 entry of cross-reference-items correlate first names, maximum of 7 entries (doesn't have in query, reference)

2) there 3 entries of items in table_agency

3) result set must qualified with: user_id=".$variable

4) original query, more or less... since there no commonality between additional information trying pull, forced create function make tie,.... should lend idea of trying achieve: 

$query = "select           a.*,           b.name,           b.id   agency_id       table_one a,  table_agency b       a.agency_id = b.id       , a.user_id = ".$variable;

now new addition of first_names correspond $result['name']

5) can use nested foreach( output final result set of ...nested array first_name???

6) please let query(response) commented, may learn hard-work! not attempting solely have question answered, learn on steps , methodology!

7) thank in advance help...this definately headscratcher. thanks!!!

you can output query

select     ta.id,     ta.name,     to.num,     to.likes,     group_concat(tt.first_name separator '-') `names` table_agency ta left join table_one `to` on to.o_id = ta.id left join table_link tl on tl.rel_a = to.id left join (select id , first_name table_two) tt on tt.id = tl.rel_b to.user_id = 765 group to.id

you can replace user_id in php code variable. , abc-0/jack-3/bob-0 can simple replace group_concat(tt.first_name separator '/') names

sql fiddle demo

output

| id | name | num |   likes |        names | -------------------------------------------- |  1 |    | 100 | android | abc-jack-bob | |  2 |    b | 100 |   birds | bob-abc-jack | |  3 |    c | 100 |     php |    bcd-sally | |  2 |    b |   2 | oranges |        sally |

edits:

here edited query. can use mysql concat function 

select     ta.id,     ta.name,     to.num,     to.likes,     group_concat(tt.first_name separator '/') `names` table_agency ta left join table_one `to` on to.o_id = ta.id left join table_link tl on tl.rel_a = to.id left join (           select            id ,            concat(first_name,'-',num_times) first_name            table_two         ) tt on tt.id = tl.rel_b group to.id;

demo

output

| id | name | num |   likes |              names | -------------------------------------------------- |  1 |    | 100 | android | abc-0/jack-3/bob-0 | |  2 |    b | 100 |   birds | abc-0/jack-3/bob-0 | |  3 |    c | 100 |     php | bcd-5/sally-194384 | |  2 |    b |   2 | oranges |       sally-194384 |

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