mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-11-13 11:04:10 +00:00
43 lines
2.2 KiB
SQL
43 lines
2.2 KiB
SQL
-- { echo }
|
|
|
|
set allow_experimental_window_functions = 1;
|
|
|
|
-- just something basic
|
|
select number, count() over (partition by intDiv(number, 3) order by number) from numbers(10);
|
|
|
|
-- proper calculation across blocks
|
|
select number, max(number) over (partition by intDiv(number, 3) order by number desc) from numbers(10) settings max_block_size = 2;
|
|
|
|
-- not a window function
|
|
select number, abs(number) over (partition by toString(intDiv(number, 3))) from numbers(10); -- { serverError 63 }
|
|
|
|
-- no partition by
|
|
select number, avg(number) over (order by number) from numbers(10);
|
|
|
|
-- no order by
|
|
select number, quantileExact(number) over (partition by intDiv(number, 3)) from numbers(10);
|
|
|
|
-- can add an alias after window spec
|
|
select number, quantileExact(number) over (partition by intDiv(number, 3)) q from numbers(10);
|
|
|
|
-- can't reference it yet -- the window functions are calculated at the
|
|
-- last stage of select, after all other functions.
|
|
select q * 10, quantileExact(number) over (partition by intDiv(number, 3)) q from numbers(10); -- { serverError 47 }
|
|
|
|
-- should work in ORDER BY though
|
|
select number, max(number) over (partition by intDiv(number, 3) order by number desc) m from numbers(10) order by m desc, number;
|
|
|
|
-- this one doesn't work yet -- looks like the column names clash, and the
|
|
-- window count() is overwritten with aggregate count()
|
|
-- select number, count(), count() over (partition by intDiv(number, 3)) from numbers(10) group by number order by count() desc;
|
|
|
|
-- different windows
|
|
-- an explain test would also be helpful, but it's too immature now and I don't
|
|
-- want to change reference all the time
|
|
select number, max(number) over (partition by intDiv(number, 3) order by number desc), count(number) over (partition by intDiv(number, 5) order by number) as m from numbers(31) order by number settings max_block_size = 2;
|
|
|
|
-- two functions over the same window
|
|
-- an explain test would also be helpful, but it's too immature now and I don't
|
|
-- want to change reference all the time
|
|
select number, max(number) over (partition by intDiv(number, 3) order by number desc), count(number) over (partition by intDiv(number, 3) order by number desc) as m from numbers(7) order by number settings max_block_size = 2;
|