\documentclass[10pt,a4paper]{article}

% Packages
\usepackage{fancyhdr}           % For header and footer
\usepackage{multicol}           % Allows multicols in tables
\usepackage{tabularx}           % Intelligent column widths
\usepackage{tabulary}           % Used in header and footer
\usepackage{hhline}             % Border under tables
\usepackage{graphicx}           % For images
\usepackage{xcolor}             % For hex colours
%\usepackage[utf8x]{inputenc}    % For unicode character support
\usepackage[T1]{fontenc}        % Without this we get weird character replacements
\usepackage{colortbl}           % For coloured tables
\usepackage{setspace}           % For line height
\usepackage{lastpage}           % Needed for total page number
\usepackage{seqsplit}           % Splits long words.
%\usepackage{opensans}          % Can't make this work so far. Shame. Would be lovely.
\usepackage[normalem]{ulem}     % For underlining links
% Most of the following are not required for the majority
% of cheat sheets but are needed for some symbol support.
\usepackage{amsmath}            % Symbols
\usepackage{MnSymbol}           % Symbols
\usepackage{wasysym}            % Symbols
%\usepackage[english,german,french,spanish,italian]{babel}              % Languages

% Document Info
\author{datamansam}
\pdfinfo{
  /Title (cleaning-data-with-sql.pdf)
  /Creator (Cheatography)
  /Author (datamansam)
  /Subject (Cleaning Data with SQL Cheat Sheet)
}

% Lengths and widths
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\renewcommand{\seqinsert}{\ifmmode\allowbreak\else\-\fi} % Hyphens in seqsplit
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% the right line height in the tables
\renewcommand{\arraystretch}{1.3}
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% Commands
\newcommand{\SetRowColor}[1]{\noalign{\gdef\RowColorName{#1}}\rowcolor{\RowColorName}} % Shortcut for row colour
\newcommand{\mymulticolumn}[3]{\multicolumn{#1}{>{\columncolor{\RowColorName}}#2}{#3}} % For coloured multi-cols
\newcolumntype{x}[1]{>{\raggedright}p{#1}} % New column types for ragged-right paragraph columns
\newcommand{\tn}{\tabularnewline} % Required as custom column type in use

% Font and Colours
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\definecolor{FootBackground}{HTML}{666666}
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\renewcommand{\familydefault}{\sfdefault}
\color{TextColor}

% Header and Footer
\pagestyle{fancy}
\fancyhead{} % Set header to blank
\fancyfoot{} % Set footer to blank
\fancyhead[L]{
\noindent
\begin{multicols}{3}
\begin{tabulary}{5.8cm}{C}
    \SetRowColor{DarkBackground}
    \vspace{-7pt}
    {\parbox{\dimexpr\textwidth-2\fboxsep\relax}{\noindent
        \hspace*{-6pt}\includegraphics[width=5.8cm]{/web/www.cheatography.com/public/images/cheatography_logo.pdf}}
    }
\end{tabulary}
\columnbreak
\begin{tabulary}{11cm}{L}
    \vspace{-2pt}\large{\bf{\textcolor{DarkBackground}{\textrm{Cleaning Data with SQL Cheat Sheet}}}} \\
    \normalsize{by \textcolor{DarkBackground}{datamansam} via \textcolor{DarkBackground}{\uline{cheatography.com/139410/cs/32044/}}}
\end{tabulary}
\end{multicols}}

\fancyfoot[L]{ \footnotesize
\noindent
\begin{multicols}{3}
\begin{tabulary}{5.8cm}{LL}
  \SetRowColor{FootBackground}
  \mymulticolumn{2}{p{5.377cm}}{\bf\textcolor{white}{Cheatographer}}  \\
  \vspace{-2pt}datamansam \\
  \uline{cheatography.com/datamansam} \\
  \end{tabulary}
\vfill
\columnbreak
\begin{tabulary}{5.8cm}{L}
  \SetRowColor{FootBackground}
  \mymulticolumn{1}{p{5.377cm}}{\bf\textcolor{white}{Cheat Sheet}}  \\
   \vspace{-2pt}Not Yet Published.\\
   Updated 30th September, 2022.\\
   Page {\thepage} of \pageref{LastPage}.
\end{tabulary}
\vfill
\columnbreak
\begin{tabulary}{5.8cm}{L}
  \SetRowColor{FootBackground}
  \mymulticolumn{1}{p{5.377cm}}{\bf\textcolor{white}{Sponsor}}  \\
  \SetRowColor{white}
  \vspace{-5pt}
  %\includegraphics[width=48px,height=48px]{dave.jpeg}
  Measure your website readability!\\
  www.readability-score.com
\end{tabulary}
\end{multicols}}




\begin{document}
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% Set font size to small. Switch to any value
% from this page to resize cheat sheet text:
% www.emerson.emory.edu/services/latex/latex_169.html
\footnotesize % Small font.

\begin{multicols*}{3}

\begin{tabularx}{5.377cm}{p{0.4977 cm} x{4.4793 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Regular Expressions}}  \tn
% Row 0
\SetRowColor{LightBackground}
\textbackslash{}d & A digit \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
{[}{]} & Any item in brackets \tn 
% Row Count 2 (+ 1)
% Row 2
\SetRowColor{LightBackground}
? & previous character 0 or 1 times \tn 
% Row Count 3 (+ 1)
% Row 3
\SetRowColor{white}
+ & Previous character 1 or more times \tn 
% Row Count 4 (+ 1)
% Row 4
\SetRowColor{LightBackground}
* & Previous character 0 or more times \tn 
% Row Count 5 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{x{2.4885 cm} x{2.4885 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Identifying Missing Data}}  \tn
% Row 0
\SetRowColor{LightBackground}
Missing Completely at Random & Missing Not at Random \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
SELECT * FROM \seqsplit{restaurant\_inspection} WHERE score IS NULL; & SELECT inspection\_type, COUNT(*) as count FROM \seqsplit{restaurant\_inspection} WHERE score IS NULL \tn 
% Row Count 7 (+ 5)
% Row 2
\SetRowColor{LightBackground}
SELECT COUNT(*) FROM \seqsplit{restaurant\_inspection} WHERE score IS NULL; & GROUP BY inspection\_type ORDER BY count D \tn 
% Row Count 11 (+ 4)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Replacing null values with an average}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{UPDATE TABLE Patient \newline SET Income = (SELECT avg(Income ) FROM Patient) \newline WHERE Income IS NULL;} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Dropping Values where a column is null}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{SELECT count(*) \newline FROM Patient \newline WHERE Weight IS NULL;} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Dealing with Duplicates}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{WITH  DuplicateWithNumber   AS   \newline  ( SELECT  Column1, Column2  \newline   , row\_number() OVER ( PARTITION BY Column1, Column2  \newline ORDER BY Column3) AS NthAppearance  \newline   FROM  YourTableName  \newline   )  \newline   DELETE  FROM DuplicateWithNumber   \newline   WHERE  NthAppearance\textgreater{} 1} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Cleaning with Case}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{UPDATE Project..housing \newline SET SoldAsVacant=CASE \newline 	WHEN SoldAsVacant = 'Y' THEN 'Yes' \newline 	WHEN SoldAsVacant = 'N' THEN 'No' \newline 	ELSE SoldAsVacant \newline END} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{x{2.4885 cm} x{2.4885 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Replacing missing values with COALESCE()}}  \tn
% Row 0
\SetRowColor{LightBackground}
The COALESCE() functiin substitutes null valuees & SELECT name, COALESCE(score, -1), inspection\_type FROM \seqsplit{restaurant\_inspection} \tn 
% Row Count 4 (+ 4)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{x{1.55618 cm} x{1.51041 cm} x{1.51041 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{3}{x{5.377cm}}{\bf\textcolor{white}{SQL Set Operations}}  \tn
% Row 0
\SetRowColor{LightBackground}
EXCEPT/MINUS & INTERSECT & UNION \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
Return the rows that are found in one relation but not the other. & the rows that are found in both relations & e rows that are found in either relation. \tn 
% Row Count 6 (+ 5)
\hhline{>{\arrayrulecolor{DarkBackground}}---}
\SetRowColor{LightBackground}
\mymulticolumn{3}{x{5.377cm}}{Note that input relations must have the same number of columns and compatible data types for the respective columns.}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}---}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Detecting out of range values}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{SELECT {\emph{ FROM series \newline WHERE rating NOT BETWEEN 0 AND 10 \newline  \newline SELECT }} FROM series \newline WHERE rating \textless{} 0 OR rating \textgreater{} 10} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
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\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
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\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Replicate: Repeats string x no of times}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{REPLICATE (string, integer) \newline  \newline REPLICATE('0', 9 - LEN(registration\_code))} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Checking if a value is a website}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{select \newline   case \newline      when email LIKE '\%.com' then email \newline      else null \newline   end AS email \newline from pension\_funds} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{p{0.54924 cm} x{2.24273 cm} x{1.78503 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{3}{x{5.377cm}}{\bf\textcolor{white}{Handy Numeric Functions}}  \tn
% Row 0
\SetRowColor{LightBackground}
IS \seqsplit{NUMERIC} & Returns true if the expression has a numeric value, false if not &  \tn 
% Row Count 4 (+ 4)
% Row 1
\SetRowColor{white}
\seqsplit{CONVERT} & Converts a character string into a number & SELECT CONVERT(int, 25.65); \tn 
% Row Count 7 (+ 3)
% Row 2
\SetRowColor{LightBackground}
\seqsplit{TRUNCATE} & n truncated to d decimal places. If you skip d, then n is truncated to 0 decimal places. If d is a negative number, the function truncates the number n to d digits left to the decimal point. & SELECT \seqsplit{TRUNCATE(123.4567},2); 100 \tn 
% Row Count 17 (+ 10)
\hhline{>{\arrayrulecolor{DarkBackground}}---}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{x{1.64241 cm} x{3.33459 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Column values must translate to type to stand}}  \tn
% Row 0
\SetRowColor{LightBackground}
ALTER TABLE & tableName \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
ALTER COLUMN & columnName \tn 
% Row Count 2 (+ 1)
% Row 2
\SetRowColor{LightBackground}
TYPE smallint & USING columnName::smallint \tn 
% Row Count 3 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{String Operations}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{-{}- SUBSTR \newline  \newline  syntax is: \newline  SUBSTR({\emph{string}}, {\emph{starting character position}}, {\emph{\# of characters}}): \newline SELECT incidnt\_num, \newline        date, \newline        SUBSTR(date, 4, 2) AS day \newline   FROM \seqsplit{tutorial.sf\_crime\_incidents\_2014\_01} \newline  \newline \# Extracting date and time specifically from a column \newline  \newline SELECT incidnt\_num, \newline        date, \newline        LEFT(date, 10) AS cleaned\_date, \newline        RIGHT(date, 17) AS cleaned\_time \newline   FROM \seqsplit{tutorial.sf\_crime\_incidents\_2014\_01} \newline  \newline \# TRIM, to remove characters \newline  from the beginning and end of a string. \newline SELECT location, \newline        TRIM(both '()' FROM location) \newline   FROM \seqsplit{tutorial.sf\_crime\_incidents\_2014\_01} \newline  \newline \# POSITION allows you to specify a substring, \newline  then returns a numerical value equal to the  \newline character number (counting from left) where that  \newline substring first appears in the target string. \newline  \newline SELECT incidnt\_num, \newline        descript, \newline        POSITION('A' IN descript) AS a\_position \newline   FROM \seqsplit{tutorial.sf\_crime\_incidents\_2014\_01} \newline  \newline \# COALESCE can replace the null values \newline  \newline SELECT incidnt\_num, \newline        descript, \newline        COALESCE(descript, 'No Description') \newline   FROM \seqsplit{tutorial.sf\_crime\_incidents\_cleandate} \newline  ORDER BY descript DESC} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{Left for time \newline Right for date \newline  \newline Trim to remove chars at beginning and end \newline  \newline Position to return the location of a character! \newline  \newline COALESCE to replace the nulls!}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}


% That's all folks
\end{multicols*}

\end{document}