SQL Count for Each Category - sql

Question

I need to count rows based on 2 fields for grouping.
Animals (a)
id group_id strain_id death_date death_cause status
-----------------------------------------------------------------------
1 512 164 2015-12-01 Culled P
2 512 164 2015-12-02 Culled A
3 512 164 2015-12-02 Surplus B
4 512 230 2015-12-06 Culled A
5 512 164 2015-12-28 Culled A
6 512 230 2016-01-20 Culled B
7 512 230 2016-01-20 Surplus P
8 512 164 NULL NULL P
9 512 230 NULL NULL B
10 512 230 NULL NULL A
11 512 164 2016-01-25 Culled B
12 512 164 2016-02-29 Culled A
13 512 230 2016-02-03 Surplus P
14 512 230 2016-02-03 Culled A
Groups (g)
id group_name
--------------
512 Mice
Strain (s)
id strain_name
----------------
164 Strain 1
230 Strain 2
Group Animal Count (gac)
id total_animals alive_count dead_count
----------------------------------------------------------------------
512 14 3 11
Mating History (mh)
id animal_id history_type history_date
--------------------------------------------------------
1001 2 MA 2015-11-20
1002 2 MR 2015-12-01
1003 3 MA 2015-12-01
1004 6 FA 2015-12-21
1005 9 FA 2016-02-07
1006 10 MA 2016-01-27
1007 11 FA 2015-12-12
So when I group them by the strain_id and the death_cause this is what they should look like visually:
Strain 1 ---- Culled
1 512 164 2015-12-01 Culled P
2 512 164 2015-12-02 Culled A
5 512 164 2015-12-28 Culled A
11 512 164 2016-01-25 Culled B
12 512 164 2016-02-29 Culled A
Strain 1 ---- Surplus
3 512 164 2015-12-02 Surplus B
Strain 2 ---- Culled
4 512 230 2015-12-06 Culled A
6 512 230 2016-01-20 Culled B
14 512 230 2016-02-03 Culled A
Strain 2 ---- Surplus
7 512 230 2016-01-20 Surplus P
13 512 230 2016-02-03 Surplus P
What I want to get from the SQL query is the following result:
g_name s_name d_cause a_total c_alive c_dead c_pup c_breeder c_total
------------------------------------------------------------------------------
Mice Strain 1 Culled 12 3 9 1 2 5
Mice Strain 1 Surplus 12 3 9 0 1 1
Mice Strain 2 Culled 12 3 9 0 1 3
Mice Strain 2 Surplus 12 3 9 2 0 2
Basically I want to count the number of animals using 2 categories which in this case is the strain_name and the death_cause
Note that for an animal to be counted as a breeder (c_breeder), I have to look at the Mating History table and check if the animal_id has ever had any of these codes MA or FA.
I am using INNER JOIN on the groups, group_animal_count, and strains. I use LEFT JOIN for mating_history since animals with a status of P won't have records in that table since they're just pups and won't be involved with mating.

Answer 1

Try:
SELECT group_name, strain_name,death_cause, count(*) as Total
FROM ANIMALS a
JOIN GROUPS g ON a.group_id = g.id
JOIN STRAIN s ON a.strain_id = s.id
GROUP BY group_name, strain_name,death_cause

Answer 2

You can do the aggregation before joining the tables:
SELECT group_name, strain_name, death_cause, total
FROM (
SELECT group_id,
strain_id,
death_cause,
COUNT(*) AS total
FROM animals
GROUP BY group_id, strain_id, death_cause
) a
INNER JOIN groups g ON ( g.group_id = a.group_id )
INNER JOIN strain s ON ( s.strain_id = a.strain_id );