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49 lines
1.9 KiB
Markdown
49 lines
1.9 KiB
Markdown
---
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slug: /en/sql-reference/aggregate-functions/reference/greatest
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title: greatest
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---
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Aggregate function that returns the greatest across a list of values. All of the list members must be of comparable types.
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Examples:
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```sql
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SELECT
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toTypeName(greatest(toUInt8(1), 2, toUInt8(3), 3.)),
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greatest(1, 2, toUInt8(3), 3.)
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```
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```response
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┌─toTypeName(greatest(toUInt8(1), 2, toUInt8(3), 3.))─┬─greatest(1, 2, toUInt8(3), 3.)─┐
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│ Float64 │ 3 │
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└─────────────────────────────────────────────────────┴────────────────────────────────┘
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```
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:::note
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The type returned is a Float64 as the UInt8 must be promoted to 64 bit for the comparison.
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:::
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```sql
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SELECT greatest(['hello'], ['there'], ['world'])
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```
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```response
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┌─greatest(['hello'], ['there'], ['world'])─┐
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│ ['world'] │
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└───────────────────────────────────────────┘
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```
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```sql
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SELECT greatest(toDateTime32(now() + toIntervalDay(1)), toDateTime64(now(), 3))
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```
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```response
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┌─greatest(toDateTime32(plus(now(), toIntervalDay(1))), toDateTime64(now(), 3))─┐
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│ 2023-05-12 01:16:59.000 │
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└──---──────────────────────────────────────────────────────────────────────────┘
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```
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:::note
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The type returned is a DateTime64 as the DataTime32 must be promoted to 64 bit for the comparison.
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:::
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Also see [least](/docs/en/sql-reference/aggregate-functions/reference/least.md).
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