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+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Challenge 1"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "SELECT \n",
+    "    a.au_id AS \"AUTHOR ID\",\n",
+    "    a.au_lname AS \"LAST NAME\",\n",
+    "    a.au_fname AS \"FIRST NAME\",\n",
+    "    t.title AS \"TITLE\",\n",
+    "    p.pub_name AS \"PUBLISHER\"\n",
+    "FROM authors a\n",
+    "JOIN titleauthor ta ON a.au_id = ta.au_id\n",
+    "JOIN titles t ON ta.title_id = t.title_id\n",
+    "JOIN publishers p ON t.pub_id = p.pub_id\n",
+    "ORDER BY a.au_id, t.title;\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Challenge 2 "
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "SELECT \n",
+    "    a.au_id AS \"AUTHOR ID\",\n",
+    "    a.au_lname AS \"LAST NAME\",\n",
+    "    a.au_fname AS \"FIRST NAME\",\n",
+    "    p.pub_name AS \"PUBLISHER\",\n",
+    "    COUNT(t.title_id) AS \"TITLE COUNT\"\n",
+    "FROM authors a\n",
+    "JOIN titleauthor ta ON a.au_id = ta.au_id\n",
+    "JOIN titles t ON ta.title_id = t.title_id\n",
+    "JOIN publishers p ON t.pub_id = p.pub_id\n",
+    "GROUP BY a.au_id, a.au_lname, a.au_fname, p.pub_name\n",
+    "ORDER BY a.au_id, p.pub_name;\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Challenge 3"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "SELECT \n",
+    "    a.au_id AS \"AUTHOR ID\",\n",
+    "    a.au_lname AS \"LAST NAME\",\n",
+    "    a.au_fname AS \"FIRST NAME\",\n",
+    "    SUM(s.qty) AS \"TOTAL\"\n",
+    "FROM authors a\n",
+    "JOIN titleauthor ta ON a.au_id = ta.au_id\n",
+    "JOIN sales s ON ta.title_id = s.title_id\n",
+    "GROUP BY a.au_id, a.au_lname, a.au_fname\n",
+    "ORDER BY TOTAL DESC\n",
+    "LIMIT 3;\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## The output"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "899-46-2035\tRinger\tAnne\t148\n",
+    "998-72-3567\tRinger\tAlbert\t133\n",
+    "213-46-8915\tGreen\tMarjorie\t50\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Challenge 4"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "SELECT \n",
+    "    a.au_id AS \"AUTHOR ID\",\n",
+    "    a.au_lname AS \"LAST NAME\",\n",
+    "    a.au_fname AS \"FIRST NAME\",\n",
+    "    COALESCE(SUM(s.qty), 0) AS \"TOTAL\"\n",
+    "FROM authors a\n",
+    "LEFT JOIN titleauthor ta ON a.au_id = ta.au_id\n",
+    "LEFT JOIN sales s ON ta.title_id = s.title_id\n",
+    "GROUP BY a.au_id, a.au_lname, a.au_fname\n",
+    "ORDER BY TOTAL DESC;\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## The output"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "899-46-2035\tRinger\tAnne\t148\n",
+    "998-72-3567\tRinger\tAlbert\t133\n",
+    "213-46-8915\tGreen\tMarjorie\t50\n",
+    "427-17-2319\tDull\tAnn\t50\n",
+    "846-92-7186\tHunter\tSheryl\t50\n",
+    "267-41-2394\tO'Leary\tMichael\t45\n",
+    "724-80-9391\tMacFeather\tStearns\t45\n",
+    "722-51-5454\tDeFrance\tMichel\t40\n",
+    "807-91-6654\tPanteley\tSylvia\t40\n",
+    "238-95-7766\tCarson\tCheryl\t30\n",
+    "486-29-1786\tLocksley\tCharlene\t25\n",
+    "472-27-2349\tGringlesby\tBurt\t20\n",
+    "648-92-1872\tBlotchet-Halls\tReginald\t20\n",
+    "672-71-3249\tYokomoto\tAkiko\t20\n",
+    "756-30-7391\tKarsen\tLivia\t20\n",
+    "172-32-1176\tWhite\tJohnson\t15\n",
+    "274-80-9391\tStraight\tDean\t15\n",
+    "409-56-7008\tBennet\tAbraham\t15\n",
+    "712-45-1867\tdel Castillo\tInnes\t10\n",
+    "341-22-1782\tSmith\tMeander\t0\n",
+    "527-72-3246\tGreene\tMorningstar\t0\n",
+    "724-08-9931\tStringer\tDirk\t0\n",
+    "893-72-1158\tMcBadden\tHeather\t0\n"
+   ]
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Python 3",
+   "language": "python",
+   "name": "python3"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 3
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython3",
+   "version": "3.11.4"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 2
+}