# name: test/sql/aggregate/aggregates/test_sem.test
# description: Test SEM operator
# group: [aggregates]

statement ok
PRAGMA enable_verification

#Corner cases
statement error
select sem()
----

query I
select sem(NULL)
----
NULL

query I
select sem(1)
----
0.000000

statement error
select sem(*)
----

statement ok
create table aggr(k int, v decimal(10,2), v2 decimal(10, 2));

statement ok
insert into aggr values(1, 10, null),(2, 10, 11), (2, 20, 22), (2, 25, null), (2, 30, 35);

query III
select k, sem(v),sem(v2)  from aggr group by k ORDER BY ALL;
----
1	0.000000	NULL
2	3.697550	5.663398

query II
select  sem(v),sem(v2) from aggr
----
3.577709	5.663398

# Window Function
query II
select k, sem(v) over (partition by k)
from aggr
order by all
----
1	0.0
2	3.6975498644372604
2	3.6975498644372604
2	3.6975498644372604
2	3.6975498644372604