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 |
