## wiring.table_schema()


Return the schema as the `dg.TableSchema` that Dagster's Columns tab shows.


Usage

``` python
wiring.table_schema(schema)
```


Each column has its dtype, description, nullability, uniqueness and column constraints. Its tags come from `dy.Column(metadata=...)`, with each value converted to a string. The primary key is a table constraint, so only `unique=True` marks a key column unique.


## Returns


`A table schema with the columns in the schema's order.`  


## Raises


`ReservedColumnError`  
A column name is in the reserved `dy_` namespace.

`InvalidColumnNameError`  
A column name has a character Dagster does not allow in an asset check name.

`CheckNameCollisionError`  
Two rules produce the same asset check name.