SQL query taking too long (LEFT OUTER JOIN)

Question

I have been testing a SQL query for a search propose to get data from the columns 'fleet', 'trips', 'bookings', 'agencies' and 'persons'.

The problem is that this query is taking too long (2min) to complete. I tryed to use 'WHERE' and/OR 'INNER JOIN' and the query time is reduced to a few milliseconds, but it doesn't give me all the results I want. For instance, there are some entries from 'trips' that don't have 'bookings' associated or some 'bookings' entries that don't have 'persons' associated. That's why I need to use the LEFT OUTER JOIN, but this is making the query very slow.

I believe that I have some efficiency problem in this syntax, but I can't figure out what it is.

I want the result to be like this:

bid     tid     tstatus    timestamp    start   end   gname pname   fname       blockedtrips  tcreator  bcreator    baname  taname
NULL    2736    1          1468022400   540     720   NULL  NULL    Little Boy  1             9         NULL        NULL    Conscience Dauphin
NULL    2737    1          1468022400   540     720   NULL  NULL    Moby Dick   1             9         NULL        NULL    Conscience Dauphin

My query is the following:

SELECT 
 bookings.id AS bid, trips.id AS tid, trips.id_status AS tstatus,
 trips.timestamp, trips.start, trips.end, bookings.groupname AS gname,
 persons.name AS pname, fleet.name AS fname, trips.blockedtrips AS blockedtrips,
 trips.id_creator AS tcreator, bookings.id_creator AS bcreator,
 (SELECT name FROM agencies WHERE deleted=false AND id=bookings.id_agency) AS baname,
 (SELECT name FROM agencies WHERE deleted=false AND id=trips.id_agency) AS taname
FROM
 trips OUTER LEFT JOIN fleet ON fleet.id = trips.id_fleet AND fleet.deleted=false AND trips.deleted=false
 LEFT OUTER JOIN bookings ON trips.id = bookings.id_trip AND bookings.deleted=false
 LEFT OUTER JOIN persons ON bookings.id = persons.id_booking AND persons.deleted=false
  AND ( 
   (SELECT name FROM agencies WHERE deleted=false AND id=bookings.id_agency) LIKE '%conscience%'
   OR (SELECT name FROM agencies WHERE deleted=false AND id=trips.id_agency) LIKE '%conscience%'
   OR bookings.groupname LIKE '%conscience%'
   OR persons.name LIKE '%conscience%'
   OR fleet.name LIKE '%conscience%'
  )
  ORDER BY trips.timestamp
  DESC LIMIT 0,100

QUERY UPDATED:

SELECT 
     bookings.id AS bid, trips.id AS tid, trips.id_status AS tstatus,
     trips.timestamp, trips.start, trips.end, bookings.groupname AS gname, 
     persons.name AS pname, fleet.name AS fname, trips.blockedtrips AS blockedtrips, 
     trips.id_creator AS tcreator, bookings.id_creator AS bcreator, 
     bagency.name AS baname, tagency.name AS taname 
FROM fleet 
     LEFT JOIN trips ON fleet.id = trips.id_fleet AND fleet.deleted=false AND trips.deleted=false
     LEFT JOIN agencies AS tagency ON tagency.id = trips.id_agency AND tagency.deleted=false
     LEFT JOIN bookings ON trips.id = bookings.id_trip AND bookings.deleted=false
     LEFT JOIN agencies AS bagency ON bagency.id = bookings.id_agency AND bagency.deleted=false  
     LEFT JOIN persons ON bookings.id = persons.id_booking AND persons.deleted=false
WHERE
     bagency.name LIKE '%conscience%' 
     OR tagency.name LIKE '%conscience%' 
     OR bookings.groupname LIKE '%conscience%' 
     OR persons.name LIKE '%conscience%' 
     OR fleet.name LIKE '%conscience%'
ORDER BY trips.timestamp DESC 
LIMIT 0,100

Answer 1

you could join the tables with agencies instead of using multiple subqueries for it, this should give you same result, try it hope it is helpful:

SELECT 
 bookings.id AS bid, trips.id AS tid, trips.id_status AS tstatus,
 trips.timestamp, trips.start, trips.end, bookings.groupname AS gname,
 persons.name AS pname, fleet.name AS fname, trips.blockedtrips AS blockedtrips,
 trips.id_creator AS tcreator, bookings.id_creator AS bcreator,
 ag1.name AS baname,
 ag2.name AS taname
FROM
 trips OUTER LEFT JOIN fleet ON fleet.id = trips.id_fleet AND fleet.deleted=false AND trips.deleted=false
 LEFT OUTER JOIN bookings ON trips.id = bookings.id_trip AND bookings.deleted=false
 LEFT OUTER JOIN persons ON bookings.id = persons.id_booking AND persons.deleted=false
 left join agencies ag1 on ag1.id=bookings.id_agency and ag1.deleted=false and ag1.name  LIKE '%conscience%'
 left join agencies ag2 on ag2.id=trips.id_agency ag2.deleted=false
  where 
   ag1.name LIKE '%conscience%'
   OR ag2.name  LIKE '%conscience%'
   OR bookings.groupname LIKE '%conscience%'
   OR persons.name LIKE '%conscience%'
   OR fleet.name LIKE '%conscience%'
  ORDER BY trips.timestamp
  DESC LIMIT 0,100