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NAME="INFOSCHEMA-CONSTRAINT-COLUMN-USAGE"
>34.17. <TT
CLASS="LITERAL"
>constraint_column_usage</TT
></A
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><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.
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>Table 34-15. <TT
CLASS="LITERAL"
>constraint_column_usage</TT
> Columns</B
></P
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>Name</TH
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>Data Type</TH
><TH
>Description</TH
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><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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