ClickHouse/docs/en/sql-reference/statements/select/limit.md

66 lines
1.6 KiB
Markdown
Raw Normal View History

---
toc_title: LIMIT
---
# LIMIT Clause {#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](../../../sql-reference/statements/select/order-by.md) clause that explicitly sorts results, the choice of rows for the result may be arbitrary and non-deterministic.
!!! note "Note"
The number of rows in the result set can also depend on the [limit](../../../operations/settings/settings.md#limit) setting.
2021-04-22 18:27:06 +00:00
## LIMIT … WITH TIES Modifier {#limit-with-ties}
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](../../../sql-reference/statements/select/order-by.md#orderby-with-fill).
For example, the following query
``` sql
SELECT * FROM (
SELECT number%50 AS n FROM numbers(100)
) ORDER BY n LIMIT 0,5
```
returns
``` text
┌─n─┐
│ 0 │
│ 0 │
│ 1 │
│ 1 │
│ 2 │
└───┘
```
but after apply `WITH TIES` modifier
``` sql
SELECT * FROM (
SELECT number%50 AS n FROM numbers(100)
) ORDER BY n LIMIT 0,5 WITH TIES
```
it returns another rows set
``` text
┌─n─┐
│ 0 │
│ 0 │
│ 1 │
│ 1 │
│ 2 │
│ 2 │
└───┘
```
cause row number 6 have same value “2” for field `n` as row number 5