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 32-8. 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)
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