Mission368Solutions.ipynb

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    "# Set up libraries and look at first few rows\n",
    "library(RSQLite)\n",
    "library(DBI)\n",
    "\n",
    "conn = dbConnect(SQLite(), \"./factbook.db\")\n",
    "q1 = \"SELECT * FROM facts LIMIT 5\"\n",
    "result1 = dbGetQuery(conn, q1)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "# Looking at summary statistics\n",
    "q2 = \"SELECT MIN(population), MAX(population), MIN(population_growth), MAX(population_growth) FROM facts\"\n",
    "result2 = dbGetQuery(conn, q2)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "# Investigating outlier values\n",
    "q3 = \"SELECT * FROM facts WHERE (population == (SELECT MAX(population) FROM facts))\"\n",
    "result3 = dbGetQuery(conn, q3)\n",
    "\n",
    "q4 = \"SELECT * FROM facts WHERE (population == (SELECT MIN(population) FROM facts))\"\n",
    "result4 = dbGetQuery(conn, q4)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "# Omitting outlier values from the query\n",
    "q5 = \"SELECT population, population_growth, birth_rate, death_rate FROM facts WHERE ((population != (SELECT MAX(population) FROM facts)) AND (population != (SELECT MIN(population) FROM facts)))\"\n",
    "result5 = dbGetQuery(conn, q5)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "# Plotting histograms for the variables from Q5\n",
    "library(tidyverse)\n",
    "\n",
    "tidy_result5 = result5 %>%\n",
    "gather(., key = \"variable\", value = \"val\")\n",
    "\n",
    "ggplot(data = result5, aes(x = val)) +\n",
    "geom_histogram() + \n",
    "facet_grid(~ variable)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "# Calculating and sorting by population density\n",
    "q7 = \"SELECT name, cast(population as float)/cast(area as float) density FROM facts ORDER BY density DESC\"\n",
    "result7 = dbGetQuery(conn, q7)"
   ]
  }
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