 </p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
       <code class="structfield">sql_data_access</code> <code class="type">character_data</code>
      </p>
      <p>
       Always <code class="literal">MODIFIES</code>, meaning that the function
       possibly modifies SQL data.  This information is not useful for
       <span class="productname">PostgreSQL</span>.
      </p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
       <code class="struc