Update namespaces

src/Except/Missing/Columns.php

@@ -0,0 +1,15 @@
+<?php
+namespace Database\Except\Missing;
+
+use Throwable;
+use Database\Except;
+
+class Columns extends Except\Query
+{
+    public function __construct(string $tableName, ?Throwable $previous = null)
+    {
+        $message = "Missing columns for {$tableName}";
+        $code = 1;
+        parent::__construct($message, $code, $previous);
+    }
+}