2020-06-18 08:24:31 +00:00
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---
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2022-08-28 14:53:34 +00:00
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slug: /en/sql-reference/aggregate-functions/reference/maxmap
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2024-06-24 11:52:30 +00:00
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sidebar_position: 164
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2020-06-18 08:24:31 +00:00
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---
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2022-06-02 10:55:18 +00:00
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# maxMap
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2020-06-18 08:24:31 +00:00
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Syntax: `maxMap(key, value)` or `maxMap(Tuple(key, value))`
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2020-09-16 14:14:33 +00:00
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Calculates the maximum from `value` array according to the keys specified in the `key` array.
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2020-09-20 16:45:57 +00:00
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Passing a tuple of keys and value arrays is identical to passing two arrays of keys and values.
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2020-09-16 14:14:33 +00:00
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The number of elements in `key` and `value` must be the same for each row that is totaled.
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2020-09-20 16:45:43 +00:00
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Returns a tuple of two arrays: keys and values calculated for the corresponding keys.
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2020-06-18 08:24:31 +00:00
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Example:
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``` sql
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SELECT maxMap(a, b)
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FROM values('a Array(Char), b Array(Int64)', (['x', 'y'], [2, 2]), (['y', 'z'], [3, 1]))
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```
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``` text
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2023-01-27 22:41:55 +00:00
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┌─maxMap(a, b)───────────┐
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│ [['x','y','z'],[2,3,1]]│
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└────────────────────────┘
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```
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