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PP3.sql
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PP3.sql
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--Cleaning Data in SQL Queries
Select *
From PortfolioProject.dbo.NashvilleHousing
--Standardizing Date Format
--Method #1 (Overwriting SaleDate)
Select SaleDate, CONVERT(Date, SaleDate)
From PortfolioProject.dbo.NashvilleHousing
Update NashvilleHousing
SET SaleDate = CONVERT(Date, SaleDate)
--Method #2 (Creating a new column named SaleDateConverted)
Select SaleDateConverted, CONVERT(Date, SaleDate)
From PortfolioProject.dbo.NashvilleHousing
ALTER TABLE NashvilleHousing
Add SaleDateConverted Date;
Update NashvilleHousing
SET SaleDateConverted = CONVERT(Date, SaleDate)
--Populate Property Address Data
Select *
From PortfolioProject.dbo.NashvilleHousing
Order by ParcelID
Select a.ParcelID, a.PropertyAddress, b.ParcelID, b.PropertyAddress, ISNULL(a.PropertyAddress, b.PropertyAddress)
From PortfolioProject.dbo.NashvilleHousing a
JOIN PortfolioProject.dbo.NashvilleHousing b
on a.ParcelID = b.ParcelID
AND a.[UniqueID ] <> b.[UniqueID ]
Where a.PropertyAddress is null
Update a
SET PropertyAddress = ISNULL(a.PropertyAddress, b.PropertyAddress)
From PortfolioProject.dbo.NashvilleHousing a
JOIN PortfolioProject.dbo.NashvilleHousing b
on a.ParcelID = b.ParcelID
AND a.[UniqueID ] <> b.[UniqueID ]
Where a.PropertyAddress is null
--Breaking out Address into Individual Columns (Address, City, State)
Select PropertyAddress
From PortfolioProject.dbo.NashvilleHousing
Select
SUBSTRING(PropertyAddress, 1, CHARINDEX(',', PropertyAddress) - 1) as Address
, SUBSTRING(PropertyAddress, CHARINDEX(',', PropertyAddress) + 1, LEN(PropertyAddress)) as Address
From PortfolioProject.dbo.NashvilleHousing
ALTER TABLE NashvilleHousing
Add PropertySplitAddress Nvarchar(255);
Update NashvilleHousing
SET PropertySplitAddress = SUBSTRING(PropertyAddress, 1, CHARINDEX(',', PropertyAddress) - 1)
ALTER TABLE NashvilleHousing
Add PropertySplitCity Nvarchar(255);
Update NashvilleHousing
SET PropertySplitCity = SUBSTRING(PropertyAddress, CHARINDEX(',', PropertyAddress) + 1, LEN(PropertyAddress))
Select *
From PortfolioProject.dbo.NashvilleHousing
Select OwnerAddress
From PortfolioProject.dbo.NashvilleHousing
Select
PARSENAME(REPLACE(OwnerAddress, ',', '.'), 3)
, PARSENAME(REPLACE(OwnerAddress, ',', '.'), 2)
, PARSENAME(REPLACE(OwnerAddress, ',', '.'), 1)
From PortfolioProject.dbo.NashvilleHousing
ALTER TABLE NashvilleHousing
Add OwnerSplitAddress Nvarchar(255);
Update NashvilleHousing
SET OwnerSplitAddress = PARSENAME(REPLACE(OwnerAddress, ',', '.'), 3)
ALTER TABLE NashvilleHousing
Add OwnerSplitCity Nvarchar(255);
Update NashvilleHousing
SET OwnerSplitCity = PARSENAME(REPLACE(OwnerAddress, ',', '.'), 2)
ALTER TABLE NashvilleHousing
Add OwnerSplitState Nvarchar(255);
Update NashvilleHousing
SET OwnerSplitState = PARSENAME(REPLACE(OwnerAddress, ',', '.'), 1)
Select *
From PortfolioProject.dbo.NashvilleHousing
--Change Y and N to Yes and No in "Sold as Vacant" field
Select Distinct(SoldAsVacant), Count(SoldAsVacant)
From PortfolioProject.dbo.NashvilleHousing
Group by SoldAsVacant
Order by 2
Select SoldAsVacant
, CASE When SoldAsVacant = 'Y' THEN 'Yes'
When SoldAsVacant = 'N' THEN 'No'
ELSE SoldAsVacant
END
From PortfolioProject.dbo.NashvilleHousing
Update NashvilleHousing
SET SoldAsVacant = CASE When SoldAsVacant = 'Y' THEN 'Yes'
When SoldAsVacant = 'N' THEN 'No'
ELSE SoldAsVacant
END
--Removing Duplicates
WITH RowNumCTE AS(
Select *,
ROW_NUMBER() OVER (
PARTITION BY ParcelID,
PropertyAddress,
SalePrice,
SaleDate,
LegalReference
ORDER BY
UniqueID
) row_num
From PortfolioProject.dbo.NashvilleHousing
)
Select *
From RowNumCTE
Where row_num > 1
Order by PropertyAddress
Select *
From PortfolioProject.dbo.NashvilleHousing
--Delete Unused Columns
Select *
From PortfolioProject.dbo.NashvilleHousing
ALTER TABLE PortfolioProject.dbo.NashvilleHousing
DROP COLUMN OwnerAddress, TaxDistrict, PropertyAddress
ALTER TABLE PortfolioProject.dbo.NashvilleHousing
DROP COLUMN SaleDate