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--
-- 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)
-- test for outer-level aggregates
-- this should work
select ten, sum(distinct four) from onek a
group by ten
having exists (select 1 from onek b where sum(distinct a.four) = b.four);
ten | sum
-----+-----
0 | 2
2 | 2
4 | 2
6 | 2
8 | 2
(5 rows)
-- this should fail because subquery has an agg of its own in WHERE
select ten, sum(distinct four) from onek a
group by ten
having exists (select 1 from onek b
where sum(distinct a.four + b.four) = b.four);
ERROR: aggregates not allowed in WHERE clause
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