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Update constraints.md #6053

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Sep 13, 2024
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Update constraints.md #6053

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40ea3d5
Update constraints.md
diegoquintanav Sep 11, 2024
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Merge branch 'current' into patch-2
mirnawong1 Sep 12, 2024
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Update website/docs/reference/resource-properties/constraints.md
mirnawong1 Sep 12, 2024
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Update website/docs/reference/resource-properties/constraints.md
mirnawong1 Sep 13, 2024
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Merge branch 'current' into patch-2
mirnawong1 Sep 13, 2024
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4 changes: 4 additions & 0 deletions website/docs/reference/resource-properties/constraints.md
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Expand Up @@ -23,6 +23,8 @@ The structure of a constraint is:
- `name` (optional): Human-friendly name for this constraint. Supported by some data platforms.
- `columns` (model-level only): List of column names to apply the constraint over

When using `foreign_key`, the schema of the relation being referenced needs to be set explicitly. You can use `{{ target.schema }}` to let dbt pass the schema used by the target being used.
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<File name='models/schema.yml'>

```yml
Expand Down Expand Up @@ -62,6 +64,8 @@ models:

</File>



## Platform-specific support

In transactional databases, it is possible to define "constraints" on the allowed values of certain columns, stricter than just the data type of those values. For example, Postgres supports and enforces all the constraints in the ANSI SQL standard (`not null`, `unique`, `primary key`, `foreign key`), plus a flexible row-level `check` constraint that evaluates to a boolean expression.
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