le(Relation rel)</code> specifies a relation whose
     name and schema name should be included as auxiliary fields in the error
     report.
    </p></li><li class="listitem"><p>
     <code class="function">errtablecol(Relation rel, int attnum)</code> specifies
     a column whose name, table name, and schema name should be included as
     auxiliary fields in the error report.
    </p></li><li class="listitem"><p>
     <code class="function">errtableconstraint(Relation rel, const char *conname)</code>
   