WIP on docs and added basic enums supports

src/QueryBuilder.php

@@ -314,6 +314,39 @@ class QueryBuilder implements Query\QueryBuilderInterface
         return $join;
     }
 
+    public function showDatabases() : self
+    {
+        $show = new Query\Show();
+
+        $this->push($show);
+
+        $show->set(Query\Show::SQL_SHOW_DATABASES);
+
+        return $this;
+    }
+
+    public function showTables(? string $database = null) : self
+    {
+        $show = new Query\Show();
+
+        $this->push($show);
+
+        $show->set(Query\Show::SQL_SHOW_TABLES, $database);
+
+        return $this;
+    }
+
+    public function showColumns(string $table) : self
+    {
+        $show = new Query\Show();
+
+        $this->push($show);
+
+        $show->set(Query\Show::SQL_SHOW_COLUMNS, $table);
+
+        return $this;
+    }
+
     public function truncate(string $table, ? string $alias = null, ? string $database = null, ? string $schema = null) : self
     {
         if ( $schema ) {