Interface DescribedColumn

Whether the column is computed rather than passed through: it has no source column (an expression, aggregate, literal or set-operation output), or its source column is itself a computed column.

Whether the column can hold NULL; null when the server does not say (PostgreSQL).

The name the client receives; '' for a column the statement leaves unnamed.

The column's 1-based position in the result.

The table or view column the value comes from unchanged; null when there is none.

The type without length, precision or scale, such as nvarchar or character varying.

The type as the server writes it, such as nvarchar(100), decimal(18,2) or character varying(100).