Question

this is my first post here.
I need create a feed like facebook with many informations like users checkins, photos, badges, etc… i need a help to create just one query to do this. how can i do to create a join with this?

select reviews.id_user, reviews.id, reviews.review
from reviews
where reviews.id_user in (1,2,3,4,5)
order by reviews.created_time desc;

select placespops.id_user, placespops.id, placespops.id_pop
from placespops
where placespops.id_user in (1,2,3,4,5)
order by placespops.created_time desc;

select usersfoursquarecheckins.id_user, usersfoursquarecheckins.id
from usersfoursquarecheckins
where usersfoursquarecheckins.id_user in (1,2,3,4,5)
order by usersfoursquarecheckins.created_time desc;

select usersfacebookcheckins.id_user, usersfacebookcheckins.id
from usersfacebookcheckins
where usersfacebookcheckins.id_user in (1,2,3,4,5)
order by usersfacebookcheckins.created_time desc;

select placesphotos.id_user, placesphotos.id
from placesphotos
where placesphotos.id_user in (1,2,3,4,5)
order by placesphotos.created_time desc;

select usersbadges.id_user, usersbadges.id
from usersbadges
where usersbadges.id_user in (1,2,3,4,5)
order by usersbadges.created_time desc;

The question is, how join all in one query?

Answer 1

In this case, it looks as though the simplest way to do this would be to union the result sets – like so:

select reviews.id_user, 
       reviews.created_time, 
       reviews.id review_id, 
       reviews.review, 
       null placespop_id, 
       null id_pop,
       null usersfoursquarecheckin_id,
       null usersfacebookcheckins_id,
       null placesphotos_id,
       null usersbadges_id
from reviews
where reviews.id_user in (1,2,3,4,5)
union all
select placespops.id_user, 
       placespops.created_time, 
       null review_id, 
       null review, 
       placespops.id placespop_id, 
       placespops.id_pop,
       null usersfoursquarecheckin_id,
       null usersfacebookcheckins_id,
       null placesphotos_id,
       null usersbadges_id
from placespops
where placespops.id_user in (1,2,3,4,5)
union all
select usersfoursquarecheckins.id_user, 
       usersfoursquarecheckins.created_time, 
       null review_id, 
       null review, 
       null placespop_id, 
       null id_pop, 
       usersfoursquarecheckins.id usersfoursquarecheckin_id,
       null usersfacebookcheckins_id,
       null placesphotos_id,
       null usersbadges_id
from usersfoursquarecheckins
where usersfoursquarecheckins.id_user in (1,2,3,4,5)
union all
select usersfacebookcheckins.id_user, 
       usersfacebookcheckins.created_time,
       null review_id, 
       null review, 
       null placespop_id, 
       null id_pop, 
       null usersfoursquarecheckin_id,
       usersfacebookcheckins.id usersfacebookcheckins_id,
       null placesphotos_id,
       null usersbadges_id
from usersfacebookcheckins
where usersfacebookcheckins.id_user in (1,2,3,4,5)
union all
select placesphotos.id_user, 
       placesphotos.created_time,
       null review_id, 
       null review, 
       null placespop_id, 
       null id_pop, 
       null usersfoursquarecheckin_id,
       null usersfacebookcheckins_id,
       placesphotos.id placesphotos_id,
       null usersbadges_id
from placesphotos
where placesphotos.id_user in (1,2,3,4,5)
union all
select usersbadges.id_user,
       usersbadges.created_time,
       null review_id, 
       null review, 
       null placespop_id, 
       null id_pop, 
       null usersfoursquarecheckin_id,
       null usersfacebookcheckins_id,
       null placesphotos_id,
       usersbadges.id usersbadges_id
from usersbadges
where usersbadges.id_user in (1,2,3,4,5)
order by 2 desc