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NAME="INFOSCHEMA-KEY-COLUMN-USAGE"
>34.31. <TT
CLASS="LITERAL"
>key_column_usage</TT
></A
></H1
><P
> The view <TT
CLASS="LITERAL"
>key_column_usage</TT
> identifies all columns
in the current database that are restricted by some unique, primary
key, or foreign key constraint. Check constraints are not included
in this view. Only those columns are shown that the current user
has access to, by way of being the owner or having some privilege.
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>Table 34-29. <TT
CLASS="LITERAL"
>key_column_usage</TT
> Columns</B
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>Name</TH
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>Data Type</TH
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>Description</TH
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><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
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>Name of the constraint</TD
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><TT
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>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 restricted by this constraint (always the
current database)
</TD
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><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 restricted by this 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 restricted
by this 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 restricted by this constraint
</TD
></TR
><TR
><TD
><TT
CLASS="LITERAL"
>ordinal_position</TT
></TD
><TD
><TT
CLASS="TYPE"
>cardinal_number</TT
></TD
><TD
> Ordinal position of the column within the constraint key (count
starts at 1)
</TD
></TR
><TR
><TD
><TT
CLASS="LITERAL"
>position_in_unique_constraint</TT
></TD
><TD
><TT
CLASS="TYPE"
>cardinal_number</TT
></TD
><TD
> For a foreign-key constraint, ordinal position of the referenced
column within its unique constraint (count starts at 1);
otherwise null
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