2020-06-18 08:24:31 +00:00
|
|
|
---
|
2022-08-28 14:53:34 +00:00
|
|
|
slug: /en/sql-reference/aggregate-functions/reference/maxmap
|
2022-04-09 13:29:05 +00:00
|
|
|
sidebar_position: 143
|
2020-06-18 08:24:31 +00:00
|
|
|
---
|
|
|
|
|
|
2022-06-02 10:55:18 +00:00
|
|
|
# maxMap
|
2020-06-18 08:24:31 +00:00
|
|
|
|
|
|
|
|
Syntax: `maxMap(key, value)` or `maxMap(Tuple(key, value))`
|
|
|
|
|
|
2020-09-16 14:14:33 +00:00
|
|
|
Calculates the maximum from `value` array according to the keys specified in the `key` array.
|
|
|
|
|
|
2020-09-20 16:45:57 +00:00
|
|
|
Passing a tuple of keys and value arrays is identical to passing two arrays of keys and values.
|
2020-09-16 14:14:33 +00:00
|
|
|
|
|
|
|
|
The number of elements in `key` and `value` must be the same for each row that is totaled.
|
|
|
|
|
|
2020-09-20 16:45:43 +00:00
|
|
|
Returns a tuple of two arrays: keys and values calculated for the corresponding keys.
|
2020-06-18 08:24:31 +00:00
|
|
|
|
|
|
|
|
Example:
|
|
|
|
|
|
|
|
|
|
``` sql
|
|
|
|
|
SELECT maxMap(a, b)
|
2023-01-27 22:41:55 +00:00
|
|
|
FROM values('a Array(Char), b Array(Int64)', (['x', 'y'], [2, 2]), (['y', 'z'], [3, 1]))
|
2020-06-18 08:24:31 +00:00
|
|
|
```
|
|
|
|
|
|
|
|
|
|
``` text
|
2023-01-27 22:41:55 +00:00
|
|
|
┌─maxMap(a, b)───────────┐
|
|
|
|
|
│ [['x','y','z'],[2,3,1]]│
|
|
|
|
|
└────────────────────────┘
|
2020-06-18 08:24:31 +00:00
|
|
|
```
|
