mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-12-16 03:12:43 +00:00
36 lines
807 B
Plaintext
36 lines
807 B
Plaintext
-- { echo }
|
|
|
|
-- create table
|
|
drop table if exists test;
|
|
create table test(`a` Nullable(Int32), `b` Nullable(Int32)) ENGINE = Memory;
|
|
insert into test (a,b) values (1,null), (2,3), (4, 5), (6,null);
|
|
-- first value
|
|
select first_value(b) from test;
|
|
3
|
|
select first_value(b) ignore nulls from test;
|
|
3
|
|
select first_value(b) respect nulls from test;
|
|
\N
|
|
-- last value
|
|
select last_value(b) from test;
|
|
5
|
|
select last_value(b) ignore nulls from test;
|
|
5
|
|
select last_value(b) respect nulls from test;
|
|
\N
|
|
SET enable_analyzer = 1;
|
|
-- first value
|
|
select first_value(b) from test;
|
|
3
|
|
select first_value(b) ignore nulls from test;
|
|
3
|
|
select first_value(b) respect nulls from test;
|
|
\N
|
|
-- last value
|
|
select last_value(b) from test;
|
|
5
|
|
select last_value(b) ignore nulls from test;
|
|
5
|
|
select last_value(b) respect nulls from test;
|
|
\N
|