table_constraints
   The view table_constraints contains all
   constraints belonging to tables that the current user owns or has
   some privilege other than SELECT on.
  
Table 36.46. table_constraints Columns
| Column Type Description | 
|---|
| 
        Name of the database that contains the constraint (always the current database) | 
| 
        Name of the schema that contains the constraint | 
| 
        Name of the constraint | 
| 
        Name of the database that contains the table (always the current database) | 
| 
        Name of the schema that contains the table | 
| 
        Name of the table | 
| 
        
       Type of the constraint:  | 
| 
        
        | 
| 
        
        | 
| 
        
       Applies to a feature not available in
       PostgreSQL (currently always
        |