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 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 34-15. constraint_column_usage Columns
|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|
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