Step: Limit

Overview

The Limit step reduces the table to a set number of rows.

Example starting data:

/*---------+--------*
 | student | score  |
 +---------+--------+
 | jane    | 83     |
 | neal    | 35     |
 | sam     | 74     |
 | pat     | 62     |
 *---------+--------*/

Example output data:

Limit to 2 rows

/*---------+--------*
 | student | score  |
 +---------+--------+
 | jane    | 83     |
 | neal    | 35     |
 *---------+--------*/

Step structure

• There will be one limit block where you will define your limit.

Field definitions

Limit

The number of rows you would like your output data to contain.

The limit step is non-deterministic if the result set isn't ordered. Different rows may be returned from subsequent queries.

Example

Let's say we are doing initial exploratory work on data. We did a number of complex steps and want to quickly execute the query so we can iterate.

Starting data:

/*---------+-------+---------+------------*
 | test    | score | student | date       |
 +---------+-------+---------+------------+
 | quiz    | 83    | jane    | 2020-04-01 |
 | quiz    | 35    | pat     | 2020-04-01 |
 | quiz    | 89    | sam     | 2020-04-01 |
 | midterm | 74    | jane    | 2020-05-01 |
 | midterm | 62    | pat     | 2020-05-01 |
 | midterm | 93    | sam     | 2020-05-01 |
 | final   | 77    | jane    | 2020-06-01 |
 | final   | 59    | pat     | 2020-06-01 |
 | final   | 92    | sam     | 2020-06-01 |
 *---------+-------+---------+------------*/

Input fields:

Output data:

/*---------+-------+---------+------------*
 | test    | score | student | date       |
 +---------+-------+---------+------------+
 | quiz    | 89    | sam     | 2020-04-01 |
 | midterm | 62    | pat     | 2020-05-01 |
 | midterm | 93    | sam     | 2020-05-01 |
 | final   | 92    | sam     | 2020-06-01 |
 *---------+-------+---------+------------*/