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Documentation of the system catalogs, directed toward PostgreSQL developers

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<entry><structfield>conkey</structfield></entry>

<entry><type>int2[]</type></entry>

<entry><literal><link linkend="catalog-pg-attribute"><structname>pg_attribute</structname></link>.attnum</></entry>

<entry>If a table constraint, list ofcolumns whichtheconstraint constrains</entry>

<entry>If a table constraint (including a foreign key), list of theconstrained columns</entry>

</row>

<row>