create table t1 (
pk int primary key,
a int,
b int,
c char(10),
d decimal(10, 3),
e real
);
insert into t1 values
( 1, 0, 1, 'one', 0.1, 0.001),
( 2, 0, 2, 'two', 0.2, 0.002),
( 3, 0, 3, 'three', 0.3, 0.003),
( 4, 1, 2, 'three', 0.4, 0.004),
( 5, 1, 1, 'two', 0.5, 0.005),
( 6, 1, 1, 'one', 0.6, 0.006),
( 7, 2, NULL, 'n_one', 0.5, 0.007),
( 8, 2, 1, 'n_two', NULL, 0.008),
( 9, 2, 2, NULL, 0.7, 0.009),
(10, 2, 0, 'n_four', 0.8, 0.010),
(11, 2, 10, NULL, 0.9, NULL);
select pk, row_number() over () from t1;
pk row_number() over () 11 22 33 44 55 66 77 88 99 1010 1111
explain FORMAT=JSON select pk, row_number() over () from t1;
EXPLAIN
{ "query_block": { "select_id": 1, "cost": "COST_REPLACED", "window_functions_computation": { "sorts": [
{ "filesort": { "sort_key": "pk"
}
}
], "temporary_table": { "nested_loop": [
{ "table": { "table_name": "t1", "access_type": "index", "key": "PRIMARY", "key_length": "4", "used_key_parts": ["pk"], "loops": 1, "rows": 11, "cost": "COST_REPLACED", "filtered": 100, "using_index": true
}
}
]
}
}
}
}
explain FORMAT=JSON select row_number() over (), pk from t1;
EXPLAIN
{ "query_block": { "select_id": 1, "cost": "COST_REPLACED", "window_functions_computation": { "sorts": [
{ "filesort": { "sort_key": "`row_number() over ()`"
}
}
], "temporary_table": { "nested_loop": [
{ "table": { "table_name": "t1", "access_type": "index", "key": "PRIMARY", "key_length": "4", "used_key_parts": ["pk"], "loops": 1, "rows": 11, "cost": "COST_REPLACED", "filtered": 100, "using_index": true
}
}
]
}
}
}
}
select row_number() over () from (select 4) as t;
row_number() over () 1
select min(a) over (), max(a) over (), a, row_number() over ()
from t1
where a = 0; min(a) over () max(a) over () a row_number() over () 0001 0002 0003
select a, min(a) over (), max(a) over (), row_number() over ()
from t1
where a = 0;
a min(a) over () max(a) over () row_number() over () 0001 0002 0003
select min(a) over () + 1, max(a) over (), row_number() over ()
from t1
where a = 0; min(a) over () + 1max(a) over () row_number() over () 101 102 103
select min(a) over () + a, max(a) over (), row_number() over ()
from t1
where a = 1; min(a) over () + a max(a) over () row_number() over () 211 212 213
select a + min(a) over (), max(a) over (), row_number() over ()
from t1
where a = 1;
a + min(a) over () max(a) over () row_number() over () 211 212 213
select a + min(a) over () from t1 where a = 1;
a + min(a) over () 2 2 2
create view win_view
as (select a, min(a) over () from t1 where a = 1);
select * from win_view;
a min(a) over () 11 11 11
drop view win_view;
create view win_view
as (select a, max(a + 1) over () from t1 where a = 1);
select * from win_view;
a max(a + 1) over () 12 12 12
drop view win_view;
drop table t1;
Messung V0.5 in Prozent
¤ Dauer der Verarbeitung: 0.10 Sekunden
(vorverarbeitet am 2026-10-08)
¤
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