Question

I have been having some trouble working with inner joins I guess:

select count(distinct id) 
  from svn1,
       svn2 
 where svn1.revno = svn2.revno 
   and svn1.type = 'Bug' 
   and svn2.authors IN (select authors 
                          from svn2 
                         where revno = '33')

How to make this faster with inner joins? My query with inner joins gives weird results.

Table Info for svn1:
Columns: id revno type
Data:
1 22 Bug
1 23 Change
1 24 Bug
2 33 Bug
2 34 Bug

Table Info for svn2:
Columns: revno authors
Data:
22 A
22 B
22 C
33 D
33 A
33 C

I want ids of type bug which have a common author with authors of revno 33. i.e ids which also have revno with authors A,D or C in it

In general I also want a query to answer give an id find other ids which have an authors in common.

Answer 1

You need something like this:

select count(distinct id)
from svn1 inner join svn2 on svn1.revno = svn2.revno
      inner join svn2 second on svn2.authors = second.authors
where svn1.type='Bug' and and second.revno='33'