37.18. constraint_column_usage #
The view constraint_column_usage identifies all columns in the current database that are used by some constraint. Only those columns are shown that are contained in a table owned by a currently enabled role. For a check constraint, this view identifies the columns that are used in the check expression. For a not-null constraint, this view identifies the column that the constraint is defined on. For a foreign key constraint, this view identifies the columns that the foreign key references. For a unique or primary key constraint, this view identifies the constrained columns.
Table 37.16. constraint_column_usage Columns
Column Type Description |
|---|
Name of the database that contains the table that contains the column that is used by some constraint (always the current database) |
Name of the schema that contains the table that contains the column that is used by some constraint |
Name of the table that contains the column that is used by some constraint |
Name of the column that is used by some constraint |
Name of the database that contains the constraint (always the current database) |
Name of the schema that contains the constraint |
Name of the constraint |