Constraint package:beam-migrate

Represents a constraint in the given column schema syntax
Some backends use this to represent their constraint attributes. Does not need to be used in practice.
Asserts that a particular column of a table has a given constraint. The syntax type parameter should be an instance of IsSql92ColumnSchemaSyntax
Column name
Constraint definition
Table name
Provide arbitrary constraints on a field of the requested type. See FieldCheck for more information on the formatting of constraints.