add example databases: hotel, university

Author: dimitri-yatsenko

db-course/001-University.ipynb

@@ -2,28 +2,24 @@
  "cells": [
   {
    "cell_type": "code",
-   "execution_count": 1,
+   "execution_count": 2,
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "The sql extension is already loaded. To reload it, use:\n",
+      "  %reload_ext sql\n"
+     ]
+    }
+   ],
    "source": [
     "import pymysql\n",
     "pymysql.install_as_MySQLdb()\n",
-    "\n",
     "%load_ext sql\n",
     "%config SqlMagic.autocommit=True\n",
-    "\n",
-    "connection_string = \"mysql://root:[email protected]\"\n",
-    "\n",
-    "%sql $connection_string"
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": 2,
-   "metadata": {},
-   "outputs": [],
-   "source": [
-    "%sql $connection_string"
+    "%sql mysql://root:[email protected]"
    ]
   },
   {