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
the current user. For a check constraint, this view identifies the
columns that are used in the check expression. 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 31.8. constraint_column_usage
Columns
Name | Data Type | Description |
---|---|---|
table_catalog |
sql_identifier |
Name of the database that contains the table that contains the column that is used by some constraint (always the current database) |
table_schema |
sql_identifier |
Name of the schema that contains the table that contains the column that is used by some constraint |
table_name |
sql_identifier |
Name of the table that contains the column that is used by some constraint |
column_name |
sql_identifier |
Name of the column that is used by some constraint |
constraint_catalog |
sql_identifier |
Name of the database that contains the constraint (always the current database) |
constraint_schema |
sql_identifier |
Name of the schema that contains the constraint |
constraint_name |
sql_identifier |
Name of the constraint |