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85 lines
2.5 KiB
Markdown
85 lines
2.5 KiB
Markdown
---
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slug: /en/sql-reference/functions/ulid-functions
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sidebar_position: 190
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sidebar_label: ULID
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---
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# Functions for Working with ULID
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## generateULID
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Generates the [ULID](https://github.com/ulid/spec).
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**Syntax**
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``` sql
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generateULID([x])
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```
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**Arguments**
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- `x` — [Expression](../../sql-reference/syntax.md#syntax-expressions) resulting in any of the [supported data types](../data-types/index.md#data_types). The resulting value is discarded, but the expression itself if used for bypassing [common subexpression elimination](../../sql-reference/functions/index.md#common-subexpression-elimination) if the function is called multiple times in one query. Optional parameter.
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**Returned value**
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The [FixedString](../data-types/fixedstring.md) type value.
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**Usage example**
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``` sql
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SELECT generateULID()
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```
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``` text
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┌─generateULID()─────────────┐
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│ 01GNB2S2FGN2P93QPXDNB4EN2R │
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└────────────────────────────┘
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```
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**Usage example if it is needed to generate multiple values in one row**
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```sql
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SELECT generateULID(1), generateULID(2)
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```
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``` text
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┌─generateULID(1)────────────┬─generateULID(2)────────────┐
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│ 01GNB2SGG4RHKVNT9ZGA4FFMNP │ 01GNB2SGG4V0HMQVH4VBVPSSRB │
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└────────────────────────────┴────────────────────────────┘
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```
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## ULIDStringToDateTime
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This function extracts the timestamp from a ULID.
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**Syntax**
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``` sql
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ULIDStringToDateTime(ulid[, timezone])
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```
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**Arguments**
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- `ulid` — Input ULID. [String](../data-types/string.md) or [FixedString(26)](../data-types/fixedstring.md).
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- `timezone` — [Timezone name](../../operations/server-configuration-parameters/settings.md#server_configuration_parameters-timezone) for the returned value (optional). [String](../data-types/string.md).
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**Returned value**
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- Timestamp with milliseconds precision. [DateTime64(3)](../data-types/datetime64.md).
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**Usage example**
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``` sql
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SELECT ULIDStringToDateTime('01GNB2S2FGN2P93QPXDNB4EN2R')
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```
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``` text
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┌─ULIDStringToDateTime('01GNB2S2FGN2P93QPXDNB4EN2R')─┐
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│ 2022-12-28 00:40:37.616 │
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└────────────────────────────────────────────────────┘
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```
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## See Also
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- [UUID](../../sql-reference/functions/uuid-functions.md)
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