">KEY</span><span class="w"> </span><span class="k">NOT</span><span class="w"> </span><span class="n">ENFORCED</span><span class="p">,</span><span class="w">
</span></span></span><span class="line"><span class="cl"><span class="w"></span><span class="n">dt</span><span class="w"> </span><span class="n">STRING</span><span class="p">,</span><span class="w"> </span><span class="c1">-- format &#39;yyyy-MM-dd&#39;
</span></span></span><span class="line"><span class="cl"><span class="c1"></span><span class="n">v</