r of tables in x.</p>
<p><code><a href="https://rdrr.io/r/base/lengths.html" class="external-link">lengths()</a></code> returns the number of fields for each table in x.</p>
<p><code>as.list.MDB()</code> returns a simple list of tibbles with all the
data from the tables in x.</p>
<p>A <a href="metaMDB.html">metaMDB</a> object gathering x and y along
with relational tables between them created using collection members
and mapping functions automatically chosen or provided by
the <code>funs</code> parameter. 