# trunc — DuckDB 1.3.2

Truncates the number

- Reference: /products/haybarn/functions/releases/duckdb-1.3.2/trunc/
- JSON: /products/haybarn/functions/api/v1/duckdb-1.3.2/functions/trunc.json
- Snapshot ID: duckdb-1.3.2
- Engine: duckdb v1.3.2
- Source ID: 0b83e5d2f6
- Binary SHA-256: 9a2ae2a4d5dbd07a5b0cb30c502d65014825d34924c681eb3faa7647e7cd2b6f
- Captured: 2026-09-05T18:37:33.818Z
- Source: https://github.com/duckdb/duckdb/releases/tag/v1.3.2
- Loaded extensions: autocomplete, core_functions, icu, json, parquet, shell

## Interpretation

- Choose a snapshot matching the target engine and build. The default is captured from the published Haybarn WASM package used by the browser playground. Historical native snapshots are also available.
- Availability is an observation in the recorded build and extension profile, not a guarantee of support in every installation or in WASM.
- Types and descriptions are declarations from duckdb_functions(). Binding can specialize result types. Null means not supplied by the catalog; do not invent defaults, optionality, argument mode, or table output columns.
- Raw parameter arrays preserve catalog order for scalar/aggregate/macro functions. Raw table arguments are alphabetical. Use callingConvention for engine-confirmed positional order and named arguments; null modes are unrecorded. Named does not mean optional. Macro defaults and special named variadic behavior are not supplied by duckdb_functions().
- Catalog examples are source material and may require data or extensions. runnableExamples contains separately verified SQL for the pinned WASM package; sample-data adaptations and guide examples are labeled separately.
- Guide annotations and recipes are separate editorial content. The browser runner always uses Haybarn WASM 1.5.5-rc3, independently of the documentation snapshot.
- All URLs beginning with / are relative to the origin hosting this document. Exports require no JavaScript, cookies, API key, or browser engine.

## Overloads

### overload-b0fec100051392ff

Kind: scalar. Parameter order: catalog-order.

```text
trunc(x: BIGINT) → BIGINT
```

Link: /products/haybarn/functions/releases/duckdb-1.3.2/trunc/#overload-b0fec100051392ff

| Argument | Catalog type | Calling mode |
| --- | --- | --- |
| x | BIGINT | not recorded |

Declared return type: BIGINT. Variadic argument type: none declared.
Stability: CONSISTENT. Declared side effects: false.

### overload-2a3ac914393be5e8

Kind: scalar. Parameter order: catalog-order.

```text
trunc(x: DECIMAL) → DECIMAL
```

Link: /products/haybarn/functions/releases/duckdb-1.3.2/trunc/#overload-2a3ac914393be5e8

| Argument | Catalog type | Calling mode |
| --- | --- | --- |
| x | DECIMAL | not recorded |

Declared return type: DECIMAL. Variadic argument type: none declared.
Stability: CONSISTENT. Declared side effects: false.

### overload-2eefd63f73c32278

Kind: scalar. Parameter order: catalog-order.

```text
trunc(x: DOUBLE) → DOUBLE
```

Link: /products/haybarn/functions/releases/duckdb-1.3.2/trunc/#overload-2eefd63f73c32278

| Argument | Catalog type | Calling mode |
| --- | --- | --- |
| x | DOUBLE | not recorded |

Declared return type: DOUBLE. Variadic argument type: none declared.
Stability: CONSISTENT. Declared side effects: false.

### overload-305e06f3f4934ea9

Kind: scalar. Parameter order: catalog-order.

```text
trunc(x: FLOAT) → FLOAT
```

Link: /products/haybarn/functions/releases/duckdb-1.3.2/trunc/#overload-305e06f3f4934ea9

| Argument | Catalog type | Calling mode |
| --- | --- | --- |
| x | FLOAT | not recorded |

Declared return type: FLOAT. Variadic argument type: none declared.
Stability: CONSISTENT. Declared side effects: false.

### overload-cae04e61d9fc03e2

Kind: scalar. Parameter order: catalog-order.

```text
trunc(x: HUGEINT) → HUGEINT
```

Link: /products/haybarn/functions/releases/duckdb-1.3.2/trunc/#overload-cae04e61d9fc03e2

| Argument | Catalog type | Calling mode |
| --- | --- | --- |
| x | HUGEINT | not recorded |

Declared return type: HUGEINT. Variadic argument type: none declared.
Stability: CONSISTENT. Declared side effects: false.

### overload-8de4a6665aa8bcc7

Kind: scalar. Parameter order: catalog-order.

```text
trunc(x: INTEGER) → INTEGER
```

Link: /products/haybarn/functions/releases/duckdb-1.3.2/trunc/#overload-8de4a6665aa8bcc7

| Argument | Catalog type | Calling mode |
| --- | --- | --- |
| x | INTEGER | not recorded |

Declared return type: INTEGER. Variadic argument type: none declared.
Stability: CONSISTENT. Declared side effects: false.

### overload-bf37b74e77487ebc

Kind: scalar. Parameter order: catalog-order.

```text
trunc(x: SMALLINT) → SMALLINT
```

Link: /products/haybarn/functions/releases/duckdb-1.3.2/trunc/#overload-bf37b74e77487ebc

| Argument | Catalog type | Calling mode |
| --- | --- | --- |
| x | SMALLINT | not recorded |

Declared return type: SMALLINT. Variadic argument type: none declared.
Stability: CONSISTENT. Declared side effects: false.

### overload-f2b8d4dd7681be97

Kind: scalar. Parameter order: catalog-order.

```text
trunc(x: TINYINT) → TINYINT
```

Link: /products/haybarn/functions/releases/duckdb-1.3.2/trunc/#overload-f2b8d4dd7681be97

| Argument | Catalog type | Calling mode |
| --- | --- | --- |
| x | TINYINT | not recorded |

Declared return type: TINYINT. Variadic argument type: none declared.
Stability: CONSISTENT. Declared side effects: false.

### overload-24e740c45d441711

Kind: scalar. Parameter order: catalog-order.

```text
trunc(x: UBIGINT) → UBIGINT
```

Link: /products/haybarn/functions/releases/duckdb-1.3.2/trunc/#overload-24e740c45d441711

| Argument | Catalog type | Calling mode |
| --- | --- | --- |
| x | UBIGINT | not recorded |

Declared return type: UBIGINT. Variadic argument type: none declared.
Stability: CONSISTENT. Declared side effects: false.

### overload-dc3042f9ad259fe1

Kind: scalar. Parameter order: catalog-order.

```text
trunc(x: UHUGEINT) → UHUGEINT
```

Link: /products/haybarn/functions/releases/duckdb-1.3.2/trunc/#overload-dc3042f9ad259fe1

| Argument | Catalog type | Calling mode |
| --- | --- | --- |
| x | UHUGEINT | not recorded |

Declared return type: UHUGEINT. Variadic argument type: none declared.
Stability: CONSISTENT. Declared side effects: false.

### overload-4a94f1a7a9b45aa7

Kind: scalar. Parameter order: catalog-order.

```text
trunc(x: UINTEGER) → UINTEGER
```

Link: /products/haybarn/functions/releases/duckdb-1.3.2/trunc/#overload-4a94f1a7a9b45aa7

| Argument | Catalog type | Calling mode |
| --- | --- | --- |
| x | UINTEGER | not recorded |

Declared return type: UINTEGER. Variadic argument type: none declared.
Stability: CONSISTENT. Declared side effects: false.

### overload-02d465783ee29595

Kind: scalar. Parameter order: catalog-order.

```text
trunc(x: USMALLINT) → USMALLINT
```

Link: /products/haybarn/functions/releases/duckdb-1.3.2/trunc/#overload-02d465783ee29595

| Argument | Catalog type | Calling mode |
| --- | --- | --- |
| x | USMALLINT | not recorded |

Declared return type: USMALLINT. Variadic argument type: none declared.
Stability: CONSISTENT. Declared side effects: false.

### overload-5b5d18597bf9d1c2

Kind: scalar. Parameter order: catalog-order.

```text
trunc(x: UTINYINT) → UTINYINT
```

Link: /products/haybarn/functions/releases/duckdb-1.3.2/trunc/#overload-5b5d18597bf9d1c2

| Argument | Catalog type | Calling mode |
| --- | --- | --- |
| x | UTINYINT | not recorded |

Declared return type: UTINYINT. Variadic argument type: none declared.
Stability: CONSISTENT. Declared side effects: false.


## Guide recipes

No guide recipes.

## Engine catalog examples

Source examples may require additional data or extensions. Expressions are wrapped in SELECT; execution verification is not recorded.

Reported for: overload-b0fec100051392ff, overload-2a3ac914393be5e8, overload-2eefd63f73c32278, overload-305e06f3f4934ea9, overload-cae04e61d9fc03e2, overload-8de4a6665aa8bcc7, overload-bf37b74e77487ebc, overload-f2b8d4dd7681be97, overload-24e740c45d441711, overload-dc3042f9ad259fe1, overload-4a94f1a7a9b45aa7, overload-02d465783ee29595, overload-5b5d18597bf9d1c2

```sql
SELECT trunc(17.4);
```

## Runnable examples

Executed successfully in Haybarn WASM 1.5.5-rc3. Sample data and guide examples are separate from the original catalog.

```sql
SELECT trunc(17.4);
```

## Additional DuckDB documentation

- [Numeric Functions](https://duckdb.org/docs/current/sql/functions/numeric#truncx)

## In other engines

### PostgreSQL: trunc()

Same function. The SQLGlot example uses the same call in both engines.

```sql
TRUNC(3.14159, 2)
```

Translation from [SQLGlot](https://github.com/tobymao/sqlglot/blob/3086608e6fd4c41c02dfba47171608d2b193fce2/tests/dialects/test_duckdb.py#L15).

### Oracle: trunc()

Same function. The SQLGlot example uses the same call in both engines.

```sql
TRUNC(3.14159, 2)
```

Translation from [SQLGlot](https://github.com/tobymao/sqlglot/blob/3086608e6fd4c41c02dfba47171608d2b193fce2/tests/dialects/test_oracle.py#L880).

### Snowflake: trunc()

Same function. The SQLGlot example uses the same call in both engines.

```sql
TRUNC(4.603, 2)
```

Translation from [SQLGlot](https://github.com/tobymao/sqlglot/blob/3086608e6fd4c41c02dfba47171608d2b193fce2/tests/dialects/test_snowflake.py#L4153).

## Observed availability

| Snapshot | Observed | Overloads | JSON |
| --- | --- | --- | --- |
| haybarn-1.5.5-rc3 | present | 26 | [reference](/products/haybarn/functions/api/v1/haybarn-1.5.5-rc3/functions/trunc.json) |
| duckdb-1.5.5 | present | 26 | [reference](/products/haybarn/functions/api/v1/duckdb-1.5.5/functions/trunc.json) |
| duckdb-1.4.4 | present | 26 | [reference](/products/haybarn/functions/api/v1/duckdb-1.4.4/functions/trunc.json) |
| duckdb-1.3.2 | present | 13 | [reference](/products/haybarn/functions/api/v1/duckdb-1.3.2/functions/trunc.json) |

Engine catalog documentation is derived from MIT-licensed Haybarn and DuckDB. [Notices](/third-party-notices.txt).