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NAME="INFOSCHEMA-CONSTRAINT-COLUMN-USAGE"
>34.17. <TT
CLASS="LITERAL"
>constraint_column_usage</TT
></A
></H1
><P
>   The view <TT
CLASS="LITERAL"
>constraint_column_usage</TT
> 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.
  </P
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>Table 34-15. <TT
CLASS="LITERAL"
>constraint_column_usage</TT
> Columns</B
></P
><TABLE
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><COL><COL><COL><THEAD
><TR
><TH
>Name</TH
><TH
>Data Type</TH
><TH
>Description</TH
></TR
></THEAD
><TBODY
><TR
><TD
><TT
CLASS="LITERAL"
>table_catalog</TT
></TD
><TD
><TT
CLASS="TYPE"
>sql_identifier</TT
></TD
><TD
>       Name of the database that contains the table that contains the
       column that is used by some constraint (always the current
       database)
      </TD
></TR
><TR
><TD
><TT
CLASS="LITERAL"
>table_schema</TT
></TD
><TD
><TT
CLASS="TYPE"
>sql_identifier</TT
></TD
><TD
>       Name of the schema that contains the table that contains the
       column that is used by some constraint
      </TD
></TR
><TR
><TD
><TT
CLASS="LITERAL"
>table_name</TT
></TD
><TD
><TT
CLASS="TYPE"
>sql_identifier</TT
></TD
><TD
>       Name of the table that contains the column that is used by some
       constraint
      </TD
></TR
><TR
><TD
><TT
CLASS="LITERAL"
>column_name</TT
></TD
><TD
><TT
CLASS="TYPE"
>sql_identifier</TT
></TD
><TD
>       Name of the column that is used by some constraint
      </TD
></TR
><TR
><TD
><TT
CLASS="LITERAL"
>constraint_catalog</TT
></TD
><TD
><TT
CLASS="TYPE"
>sql_identifier</TT
></TD
><TD
>Name of the database that contains the constraint (always the current database)</TD
></TR
><TR
><TD
><TT
CLASS="LITERAL"
>constraint_schema</TT
></TD
><TD
><TT
CLASS="TYPE"
>sql_identifier</TT
></TD
><TD
>Name of the schema that contains the constraint</TD
></TR
><TR
><TD
><TT
CLASS="LITERAL"
>constraint_name</TT
></TD
><TD
><TT
CLASS="TYPE"
>sql_identifier</TT
></TD
><TD
>Name of the constraint</TD
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