1.6 KiB
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LIMIT |
LIMIT Clause
LIMIT m
allows to select the first m
rows from the result.
LIMIT n, m
allows to select the m
rows from the result after skipping the first n
rows. The LIMIT m OFFSET n
syntax is equivalent.
n
and m
must be non-negative integers.
If there is no ORDER BY clause that explicitly sorts results, the choice of rows for the result may be arbitrary and non-deterministic.
:::note
The number of rows in the result set can also depend on the limit setting.
:::
LIMIT … WITH TIES Modifier
When you set WITH TIES
modifier for LIMIT n[,m]
and specify ORDER BY expr_list
, you will get in result first n
or n,m
rows and all rows with same ORDER BY
fields values equal to row at position n
for LIMIT n
and m
for LIMIT n,m
.
This modifier also can be combined with ORDER BY … WITH FILL modifier.
For example, the following query
SELECT * FROM (
SELECT number%50 AS n FROM numbers(100)
) ORDER BY n LIMIT 0,5
returns
┌─n─┐
│ 0 │
│ 0 │
│ 1 │
│ 1 │
│ 2 │
└───┘
but after apply WITH TIES
modifier
SELECT * FROM (
SELECT number%50 AS n FROM numbers(100)
) ORDER BY n LIMIT 0,5 WITH TIES
it returns another rows set
┌─n─┐
│ 0 │
│ 0 │
│ 1 │
│ 1 │
│ 2 │
│ 2 │
└───┘
cause row number 6 have same value “2” for field n
as row number 5