--
-- AGGREGATES
--
SELECT avg(four) AS avg_1 FROM onek;
       avg_1        
--------------------
 1.5000000000000000
(1 row)

SELECT avg(a) AS avg_32 FROM aggtest WHERE a < 100;
       avg_32        
---------------------
 32.6666666666666667
(1 row)

-- In 7.1, avg(float4) is computed using float8 arithmetic.
-- Round the result to 3 digits to avoid platform-specific results.
SELECT avg(b)::numeric(10,3) AS avg_107_943 FROM aggtest;
 avg_107_943 
-------------
     107.943
(1 row)

SELECT avg(gpa) AS avg_3_4 FROM ONLY student;
 avg_3_4 
---------
     3.4
(1 row)

SELECT sum(four) AS sum_1500 FROM onek;
 sum_1500 
----------
     1500
(1 row)

SELECT sum(a) AS sum_198 FROM aggtest;
 sum_198 
---------
     198
(1 row)

SELECT sum(b) AS avg_431_773 FROM aggtest;
 avg_431_773 
-------------
     431.773
(1 row)

SELECT sum(gpa) AS avg_6_8 FROM ONLY student;
 avg_6_8 
---------
     6.8
(1 row)

SELECT max(four) AS max_3 FROM onek;
 max_3 
-------
     3
(1 row)

SELECT max(a) AS max_100 FROM aggtest;
 max_100 
---------
     100
(1 row)

SELECT max(aggtest.b) AS max_324_78 FROM aggtest;
 max_324_78 
------------
     324.78
(1 row)

SELECT max(student.gpa) AS max_3_7 FROM student;
 max_3_7 
---------
     3.7
(1 row)

SELECT count(four) AS cnt_1000 FROM onek;
 cnt_1000 
----------
     1000
(1 row)

SELECT count(DISTINCT four) AS cnt_4 FROM onek;
 cnt_4 
-------
     4
(1 row)

select ten, count(*), sum(four) from onek
group by ten order by ten;
 ten | count | sum 
-----+-------+-----
   0 |   100 | 100
   1 |   100 | 200
   2 |   100 | 100
   3 |   100 | 200
   4 |   100 | 100
   5 |   100 | 200
   6 |   100 | 100
   7 |   100 | 200
   8 |   100 | 100
   9 |   100 | 200
(10 rows)

select ten, count(four), sum(DISTINCT four) from onek
group by ten order by ten;
 ten | count | sum 
-----+-------+-----
   0 |   100 |   2
   1 |   100 |   4
   2 |   100 |   2
   3 |   100 |   4
   4 |   100 |   2
   5 |   100 |   4
   6 |   100 |   2
   7 |   100 |   4
   8 |   100 |   2
   9 |   100 |   4
(10 rows)

SELECT newavg(four) AS avg_1 FROM onek;
       avg_1        
--------------------
 1.5000000000000000
(1 row)

SELECT newsum(four) AS sum_1500 FROM onek;
 sum_1500 
----------
     1500
(1 row)

SELECT newcnt(four) AS cnt_1000 FROM onek;
 cnt_1000 
----------
     1000
(1 row)