course2-big-data-analysis/c02w02-Demo.ipynb

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   "cell_type": "markdown",
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   "source": [
    "We have precreated database `stackoverflow_`. Firstly, investigate it. What tables does it has?"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "\n",
      "Logging initialized using configuration in jar:file:/usr/local/apache-hive-1.1.0-bin/lib/hive-common-1.1.0.jar!/hive-log4j.properties\n",
      "FAILED: SemanticException [Error 10072]: Database does not exist: stackoverflow_\n"
     ]
    }
   ],
   "source": [
    "! hive --database stackoverflow_ -e 'show tables'"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "###### Querying to the database"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "Add necessary JAR-files."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Writing query.hql\n"
     ]
    }
   ],
   "source": [
    "%%writefile query.hql\n",
    "\n",
    "ADD JAR /opt/cloudera/parcels/CDH/lib/hive/lib/hive-contrib.jar;\n",
    "ADD JAR /opt/cloudera/parcels/CDH/lib/hive/lib/hive-serde.jar;"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "Include precreated database `stackoverflow_`."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Appending to query.hql\n"
     ]
    }
   ],
   "source": [
    "%%writefile -a query.hql\n",
    "\n",
    "USE stackoverflow_;"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "Then, write a simple query."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Appending to query.hql\n"
     ]
    }
   ],
   "source": [
    "%%writefile -a query.hql\n",
    "\n",
    "SELECT * FROM posts LIMIT 10;\n",
    "SELECT * FROM users LIMIT 10;"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "And finally, let's execute received `HiveQL`-file."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "\n",
      "Logging initialized using configuration in jar:file:/usr/local/apache-hive-1.1.0-bin/lib/hive-common-1.1.0.jar!/hive-log4j.properties\n",
      "Added [/opt/cloudera/parcels/CDH/lib/hive/lib/hive-contrib.jar] to class path\n",
      "Added resources: [/opt/cloudera/parcels/CDH/lib/hive/lib/hive-contrib.jar]\n",
      "Added [/opt/cloudera/parcels/CDH/lib/hive/lib/hive-serde.jar] to class path\n",
      "Added resources: [/opt/cloudera/parcels/CDH/lib/hive/lib/hive-serde.jar]\n",
      "FAILED: SemanticException [Error 10072]: Database does not exist: stackoverflow_\n"
     ]
    }
   ],
   "source": [
    "! hive -f query.hql"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": []
  }
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