Day 2.ipynb

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   "source": [
    "# MYSQL - Day 2"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "<br/>"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### Query 1 : Employees Earning More Than Their Managers ###"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "![Day2_Q1](Img/Day2_Q1.PNG)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "#### Solution ####"
   ]
  },
  {
   "cell_type": "markdown",
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   "source": [
    "\n",
    "SELECT e1.Name AS Employee \n",
    "FROM Employee as e1, Employee as e2\n",
    "WHERE (e1.ManagerId = e2.Id) AND (e1.Salary>e2.Salary);\n",
    "\n"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "<br/>"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### Query 2 :  Duplicate Emails ###"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "![Day2_Q2](Img/Day2_Q2.PNG)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "#### Solution #### "
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "\n",
    "SELECT Email \n",
    "FROM Person GROUP BY Email HAVING COUNT(Email)>1;\n",
    "\n"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "<br/>"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### Query 3 : Customers Who Never Order ###"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "![Day2_Q3](Img/Day2_Q3.PNG)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "#### Solution #### "
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "\n",
    "SELECT Name AS Customers \n",
    "FROM Customers AS c \n",
    "WHERE c.Id NOT IN (SELECT o.CustomerId FROM Orders AS o);\n",
    "\n"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "<br/>"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### Query 4 : Department Highest Salary ###"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "![Day2_Q4](Img/Day2_Q4.PNG)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "#### Solution #### "
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "\n",
    "SELECT D.Name AS Department, E.Name AS Employee, E.Salary AS Salary\n",
    "FROM Employee AS E INNER JOIN Department AS D ON E.DepartmentId = D.Id\n",
    "WHERE (DepartmentId, Salary) IN (SELECT DepartmentId, MAX(Salary) FROM Employee GROUP BY DepartmentId);\n",
    "\n"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "<br/>"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### Query 5 : Department Top Three Salaries ### "
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "![Day2_Q5](Img/Day2_Q5.PNG)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "#### Solution #### "
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "![Day2_Q5_Sol](Img/Day2_Q5_Sol.PNG)"
   ]
  }
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