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Merge pull request #50157 from den-crane/Doc/greatest_least

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Doc. Move least/greatest to conditional-functions
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Dan Roscigno 2023-05-24 09:01:58 -04:00 committed by GitHub
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48
docs/en/sql-reference/aggregate-functions/reference/greatest.md
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---
slug: /en/sql-reference/aggregate-functions/reference/greatest
title: greatest
---
Aggregate function that returns the greatest across a list of values. All of the list members must be of comparable types.
Examples:
```sql
SELECT
toTypeName(greatest(toUInt8(1), 2, toUInt8(3), 3.)),
greatest(1, 2, toUInt8(3), 3.)
```
```response
┌─toTypeName(greatest(toUInt8(1), 2, toUInt8(3), 3.))─┬─greatest(1, 2, toUInt8(3), 3.)─┐
│ Float64 │ 3 │
└─────────────────────────────────────────────────────┴────────────────────────────────┘
```
:::note
The type returned is a Float64 as the UInt8 must be promoted to 64 bit for the comparison.
:::
```sql
SELECT greatest(['hello'], ['there'], ['world'])
```
```response
┌─greatest(['hello'], ['there'], ['world'])─┐
│ ['world'] │
└───────────────────────────────────────────┘
```
```sql
SELECT greatest(toDateTime32(now() + toIntervalDay(1)), toDateTime64(now(), 3))
```
```response
┌─greatest(toDateTime32(plus(now(), toIntervalDay(1))), toDateTime64(now(), 3))─┐
│ 2023-05-12 01:16:59.000 │
└──---──────────────────────────────────────────────────────────────────────────┘
```
:::note
The type returned is a DateTime64 as the DataTime32 must be promoted to 64 bit for the comparison.
:::
Also see [least](/docs/en/sql-reference/aggregate-functions/reference/least.md).

48
docs/en/sql-reference/aggregate-functions/reference/least.md
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@ -1,48 +0,0 @@
---
slug: /en/sql-reference/aggregate-functions/reference/least
title: least
---
Aggregate function that returns the least across a list of values. All of the list members must be of comparable types.
Examples:
```sql
SELECT
toTypeName(least(toUInt8(1), 2, toUInt8(3), 3.)),
least(1, 2, toUInt8(3), 3.)
```
```response
┌─toTypeName(least(toUInt8(1), 2, toUInt8(3), 3.))─┬─least(1, 2, toUInt8(3), 3.)─┐
│ Float64 │ 1 │
└──────────────────────────────────────────────────┴─────────────────────────────┘
```
:::note
The type returned is a Float64 as the UInt8 must be promoted to 64 bit for the comparison.
:::
```sql
SELECT least(['hello'], ['there'], ['world'])
```
```response
┌─least(['hello'], ['there'], ['world'])─┐
│ ['hello'] │
└────────────────────────────────────────┘
```
```sql
SELECT least(toDateTime32(now() + toIntervalDay(1)), toDateTime64(now(), 3))
```
```response
┌─least(toDateTime32(plus(now(), toIntervalDay(1))), toDateTime64(now(), 3))─┐
│ 2023-05-12 01:16:59.000 │
└────────────────────────────────────────────────────────────────────────────┘
```
:::note
The type returned is a DateTime64 as the DataTime32 must be promoted to 64 bit for the comparison.
:::
Also see [greatest](/docs/en/sql-reference/aggregate-functions/reference/greatest.md).

82
docs/en/sql-reference/functions/conditional-functions.md
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@ -152,3 +152,85 @@ FROM LEFT_RIGHT
│ 4 │ ᴺᵁᴸᴸ │ Both equal │ │ 4 │ ᴺᵁᴸᴸ │ Both equal │
└──────┴───────┴──────────────────┘ └──────┴───────┴──────────────────┘
``` ```
## greatest
Returns the greatest across a list of values. All of the list members must be of comparable types.
Examples:
```sql
SELECT greatest(1, 2, toUInt8(3), 3.) result, toTypeName(result) type;
```
```response
┌─result─┬─type────┐
│ 3 │ Float64 │
└────────┴─────────┘
```
:::note
The type returned is a Float64 as the UInt8 must be promoted to 64 bit for the comparison.
:::
```sql
SELECT greatest(['hello'], ['there'], ['world'])
```
```response
┌─greatest(['hello'], ['there'], ['world'])─┐
│ ['world'] │
└───────────────────────────────────────────┘
```
```sql
SELECT greatest(toDateTime32(now() + toIntervalDay(1)), toDateTime64(now(), 3))
```
```response
┌─greatest(toDateTime32(plus(now(), toIntervalDay(1))), toDateTime64(now(), 3))─┐
│ 2023-05-12 01:16:59.000 │
└──---──────────────────────────────────────────────────────────────────────────┘
```
:::note
The type returned is a DateTime64 as the DataTime32 must be promoted to 64 bit for the comparison.
:::
## least
Returns the least across a list of values. All of the list members must be of comparable types.
Examples:
```sql
SELECT least(1, 2, toUInt8(3), 3.) result, toTypeName(result) type;
```
```response
┌─result─┬─type────┐
│ 1 │ Float64 │
└────────┴─────────┘
```
:::note
The type returned is a Float64 as the UInt8 must be promoted to 64 bit for the comparison.
:::
```sql
SELECT least(['hello'], ['there'], ['world'])
```
```response
┌─least(['hello'], ['there'], ['world'])─┐
│ ['hello'] │
└────────────────────────────────────────┘
```
```sql
SELECT least(toDateTime32(now() + toIntervalDay(1)), toDateTime64(now(), 3))
```
```response
┌─least(toDateTime32(plus(now(), toIntervalDay(1))), toDateTime64(now(), 3))─┐
│ 2023-05-12 01:16:59.000 │
└────────────────────────────────────────────────────────────────────────────┘
```
:::note
The type returned is a DateTime64 as the DataTime32 must be promoted to 64 bit for the comparison.
:::