# corr — DuckDB 1.3.2

Returns the correlation coefficient for non-null pairs in a group.

- Reference: /products/haybarn/functions/releases/duckdb-1.3.2/corr/
- JSON: /products/haybarn/functions/api/v1/duckdb-1.3.2/functions/corr.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-612f86a996c29968

Kind: aggregate. Parameter order: catalog-order.

```text
corr(y: DOUBLE, x: DOUBLE) → DOUBLE
```

Link: /products/haybarn/functions/releases/duckdb-1.3.2/corr/#overload-612f86a996c29968

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

Declared return type: DOUBLE. 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-612f86a996c29968

```sql
SELECT COVAR_POP(y, x) / (STDDEV_POP(x) * STDDEV_POP(y));
```

## Runnable examples

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

```sql
SELECT COVAR_POP(y, x) / (STDDEV_POP(x) * STDDEV_POP(y))
FROM (VALUES
  (10, 10),
  (20, 20),
  (NULL, NULL)
) AS sample("x", "y");
```

## Additional DuckDB documentation

- [Aggregate Functions](https://duckdb.org/docs/current/sql/functions/aggregates#corry-x)

## In other engines

### PostgreSQL: corr()

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

```sql
SELECT CORR(a, b)
```

Translation from [SQLGlot](https://github.com/tobymao/sqlglot/blob/3086608e6fd4c41c02dfba47171608d2b193fce2/tests/dialects/test_postgres.py#L1721).

### Snowflake: corr()

Uses corr as part of a larger rewrite.

Snowflake:

```sql
SELECT CORR(a, b)
```

Haybarn / DuckDB:

```sql
SELECT CASE WHEN ISNAN(CORR(a, b)) THEN NULL ELSE CORR(a, b) END
```

Translation from [SQLGlot](https://github.com/tobymao/sqlglot/blob/3086608e6fd4c41c02dfba47171608d2b193fce2/tests/dialects/test_snowflake.py#L6706).

## Observed availability

| Snapshot | Observed | Overloads | JSON |
| --- | --- | --- | --- |
| haybarn-1.5.5-rc3 | present | 1 | [reference](/products/haybarn/functions/api/v1/haybarn-1.5.5-rc3/functions/corr.json) |
| duckdb-1.5.5 | present | 1 | [reference](/products/haybarn/functions/api/v1/duckdb-1.5.5/functions/corr.json) |
| duckdb-1.4.4 | present | 1 | [reference](/products/haybarn/functions/api/v1/duckdb-1.4.4/functions/corr.json) |
| duckdb-1.3.2 | present | 1 | [reference](/products/haybarn/functions/api/v1/duckdb-1.3.2/functions/corr.json) |

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