mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-10-17 14:00:51 +00:00
26 lines
788 B
Markdown
26 lines
788 B
Markdown
|
---
|
|||
|
|
toc_priority: 143
|
|||
|
|
---
|
|||
|
|
|
|||
|
|
# maxMap {#agg_functions-maxmap}
|
|||
|
|
|
|||
|
|
Syntax: `maxMap(key, value)` or `maxMap(Tuple(key, value))`
|
|||
|
|
|
|||
|
|
Calculates the maximum from `value` array according to the keys specified in the ‘key’ array.
|
|||
|
|
Passing tuple of keys and values arrays is synonymical to passing two arrays of keys and values.
|
|||
|
|
The number of elements in ‘key’ and ‘value’ must be the same for each row that is totaled.
|
|||
|
|
Returns a tuple of two arrays: keys in sorted order, and values calculated for the corresponding keys.
|
|||
|
|
|
|||
|
|
Example:
|
|||
|
|
|
|||
|
|
``` sql
|
|||
|
|
SELECT maxMap(a, b)
|
|||
|
|
FROM values('a Array(Int32), b Array(Int64)', ([1, 2], [2, 2]), ([2, 3], [1, 1]))
|
|||
|
|
```
|
|||
|
|
|
|||
|
|
``` text
|
|||
|
|
┌─maxMap(a, b)──────┐
|
|||
|
|
│ ([1,2,3],[2,2,1]) │
|
|||
|
|
└───────────────────┘
|
|||
|
|
```
|