35.18. constraint_column_usage

35.18. `constraint_column_usage`
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## 35.18. `constraint_column_usage` #

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 not-null constraint, this view identifies the column that the constraint is defined on. 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 35.16. constraint_column_usage Columns

Column 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

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