db_schema.xml

<?xml version="1.0"?>
<!--
/**
* @category BDCrops
* @package BDC\Declarative Schema
* @author Abdul Matin <matinict@gmail.com / info@bdcrops.com >
* @copyright Copyright (c) 2018 BDCrops, Ltd (http://www.bdcrops.com)
* @license http://opensource.org/licenses/afl-3.0.php Academic Free License (AFL 3.0)
 */
-->
<schema xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Setup/Declaration/Schema/etc/schema.xsd">
   <table name="bdcrops_custom" resource="default" engine="innodb" comment="bdcrops declarative table">
        <column xsi:type="smallint" name="id" padding="6" unsigned="false" nullable="false" identity="true" comment="ID"/>
        <column xsi:type="varchar" name="name" nullable="false" length="25" comment="Name"/>
        <column xsi:type="varchar" name="description" nullable="false" length="255" comment="Descrition"/>
        <column xsi:type="timestamp" name="created"  comment="Time of event"/>
        <column xsi:type="timestamp" name="date_closed"  comment="Time of event"/>
        <constraint xsi:type="primary" referenceId="PRIMARY">   <column name="id"/> </constraint>
    </table>
</schema>