\documentclass[10pt,a4paper]{article}

% Packages
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\usepackage{multicol}           % Allows multicols in tables
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\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{cgeeeeh}
\pdfinfo{
  /Title (mongodb.pdf)
  /Creator (Cheatography)
  /Author (cgeeeeh)
  /Subject (MongoDB Cheat Sheet)
}

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% 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{MongoDB Cheat Sheet}}}} \\
    \normalsize{by \textcolor{DarkBackground}{cgeeeeh} via \textcolor{DarkBackground}{\uline{cheatography.com/191000/cs/40129/}}}
\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}cgeeeeh \\
  \uline{cheatography.com/cgeeeeh} \\
  \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, 2023.\\
   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}
\raggedright
\raggedcolumns

% 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}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{增+查}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{use shop 使用collections} \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{db.products.insert()/insertOne()/insertMany({[}data{]},\{ordered:false\}),注意\_id不能重复，且insertmany报错不会回滚已经插入的数据} \tn 
% Row Count 4 (+ 3)
% Row 2
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{\seqsplit{ordered:false，意味着啥}} \tn 
% Row Count 5 (+ 1)
% Row 3
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{db.products.insertOne(\{"name":"Ben's book", price:12.99\})} \tn 
% Row Count 7 (+ 2)
% Row 4
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{db.authors.insertMany\{ {[}\{name: "Ben", age:22\}, \{name: "Ben", age:22\}{]} \}} \tn 
% Row Count 9 (+ 2)
% Row 5
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{db.products.find(\{"name":"Ben"\}, \{\_id:0, "age":1\})，要筛选啥，要的列扣1，\_id是自带的索引} \tn 
% Row Count 12 (+ 3)
% Row 6
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{db.products.find(\{age: \{\$gt:30\}\})，还有\$eq,\$ne,\$gt,\$gte,\$lt,\$lte,\$eq可以接null} \tn 
% Row Count 14 (+ 2)
% Row 7
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{db.products.find(\{\$expr:\{\$gt:{[}"\$volume","\$target"{]}\}\})，volumn和target两个字段，比大小，必须用\$expr} \tn 
% Row Count 17 (+ 3)
% Row 8
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{db.movies.find(\{"rating.average":\{\$gt:7\}\})，embedded需要用.和双引号} \tn 
% Row Count 19 (+ 2)
% Row 9
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{\seqsplit{\#embeded+多重：db.users}.find(\{hobbies:\{title:'sports',frequency:4\}\})} \tn 
% Row Count 21 (+ 2)
% Row 10
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{db.movies.find(\{genre: {[}"Drama"{]}\})，genre有且仅有Drama，如果没有方括号就是包括Drama} \tn 
% Row Count 23 (+ 2)
% Row 11
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{\seqsplit{\#就要这两个值，且有序：db}.boxoffice.find(\{"genre": {[}'drama','action'{]} \})} \tn 
% Row Count 25 (+ 2)
% Row 12
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{\#好几个值都要,可以再有多余的，且无序：db.boxoffice.find(\{"genre":\{\$all:{[}'drama','action'{]}\}\})} \tn 
% Row Count 28 (+ 3)
% Row 13
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{\seqsplit{\#找到第一条，db.movies.findOne()}} \tn 
% Row Count 29 (+ 1)
% Row 14
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{find函数in符号：\{\$in,\$nin:{[}30{]}/{[}30,40{]}\}相当于sql的in not in} \tn 
% Row Count 31 (+ 2)
\end{tabularx}
\par\addvspace{1.3em}

\vfill
\columnbreak
\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{增+查 (cont)}}  \tn
% Row 15
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{\seqsplit{find函数or/and/not：db}.movies.find(\{\$or: {[} \{"rating.average":\{\$lt:5\}\}, \{"rating.average":\{\$gt:9.3\}\} {]}\})} \tn 
% Row Count 3 (+ 3)
% Row 16
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{\seqsplit{find函数，\$and函数会把doc里面所有的doc都遍历一遍，可能一个doc满足条件A，一个满足B，就能被选入}} \tn 
% Row Count 6 (+ 3)
% Row 17
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{find函数，\$elemMatch \seqsplit{是doc同时满足才能入选}} \tn 
% Row Count 8 (+ 2)
% Row 18
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{\seqsplit{find函数exists：\$exists:} true} \tn 
% Row Count 9 (+ 1)
% Row 19
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{find函数判断类型：\{\$type: "string"/"double"/"number"\}} \tn 
% Row Count 11 (+ 2)
% Row 20
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{\seqsplit{find函数，summary："musical"可以找到所有summary里面包含musical的document}} \tn 
% Row Count 13 (+ 2)
% Row 21
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{find函数，summary：\{\$regrex: /musical/\}可以找到所有包含summary里面包含musical的document} \tn 
% Row Count 16 (+ 3)
% Row 22
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{\seqsplit{\#doc里的hobbies里面有两个子doc} db.users.find(\{'hobbies':\{\$size:2\}\})} \tn 
% Row Count 18 (+ 2)
% Row 23
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{\seqsplit{在find写完后.count()可以统计数量}} \tn 
% Row Count 19 (+ 1)
% Row 24
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{\seqsplit{去重：db.students.distinct("class"}, \{ grade: "A" \})} \tn 
% Row Count 21 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{区别，优势}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{\seqsplit{MongoDB允许存储的数据部分，甚至完全不同，而sql有固定的列}} \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{\seqsplit{Mongo一对一的关系（比如病人对一张病例单）用embeded存储，而sql会存在不同的表里}} \tn 
% Row Count 5 (+ 3)
% Row 2
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{\seqsplit{Mongo一对一的关系（一个名字既有薪水也有车辆信息），如果两个表都单独做分析，就单独存储。如果都要分析，那也可以join}} \tn 
% Row Count 9 (+ 4)
% Row 3
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{\seqsplit{Mongo一对多的关系：数据里有别的collection的document的id}} \tn 
% Row Count 11 (+ 2)
% Row 4
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{\seqsplit{Mongodb多对多：一个document里面存储多个\_id}} \tn 
% Row Count 13 (+ 2)
% Row 5
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{db.books.aggregate({[}     \{\$lookup:\{from: "authors", localField:"authors", foreignField:"\_id", as: "creators"\} \} {]})} \tn 
% Row Count 16 (+ 3)
% Row 6
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{\seqsplit{把authorjoin进book里面：from是外表，localfield是本表的列，foreignfield是外表的列，as是本表新引进来数据的名字}} \tn 
% Row Count 19 (+ 3)
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{改}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{db.customers.update( \{\}, \{\$set:  \{orders: {[}{]}\}  \} )} \tn 
% Row Count 1 (+ 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}{CRUD \seqsplit{运算都是原子计算，不会回滚}}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{insertOne()} \tn 
% Row Count 1 (+ 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}{删}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{db.patients.deleteMany(\{"history.disease":"flu"\})} \tn 
% Row Count 1 (+ 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}{聚合函数}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{db.students.aggregate({[}} \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{\{\$group: \{\_id: "\$class", // 使用 \$group \seqsplit{按班级分组，distinctGrades:} \{ \$addToSet: "\$grade" \} // 使用 \$addToSet \seqsplit{获取每个班级的不同年级}         \}     \},} \tn 
% Row Count 5 (+ 4)
% Row 2
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{\{\$project: \{\_id: 0, // 不显示默认的 \_id 字段，class: "\$\_id", // \seqsplit{重新命名字段，distinctGrades:} 1 // 保留 distinctGrades 字段\}     \}} \tn 
% Row Count 8 (+ 3)
% Row 3
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{{]})} \tn 
% Row Count 9 (+ 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}{sort/projections/slices}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{\#降序db.movies.find(\{\}).sort(\{ 'rating.average':-1,runtime:1 \})/1是升序} \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{\seqsplit{\#跳过和限制打印：find()}.sort().skip(2).limit(5)} \tn 
% Row Count 4 (+ 2)
% Row 2
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{\#投影 find(),\{url:1,name:1,\_id:0\} \seqsplit{id是强制显示的，除非你取消}} \tn 
% Row Count 6 (+ 2)
% Row 3
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{\#slice db.movtes.find(\{"rating.average":{[}\$gt;9{]}\},\{genres:\{\$slice:{[}1,2{]}\}, \seqsplit{name:1)，genre是一个数组，取第二第三个element，再取name}} \tn 
% Row Count 9 (+ 3)
% Row 4
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{\seqsplit{数据格式转化：\$convert:} \{ input: \textless{}string\textgreater{}, to: "date"\} converts a string to ISODate} \tn 
% Row Count 11 (+ 2)
% Row 5
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{\$isoWeekYear extracts the year value of a date field} \tn 
% Row Count 13 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{update}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{\seqsplit{\#先用find函数查，再用updateOne}, updateMany去修改} \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{db.users.updateOne(\{name: " Cammy Soh"\}, \{\$set: {[}hobbies: {[}\{title: "cooking", frequency: 7\}{]}\}\}) 把cammy的hobbies \seqsplit{属性给删除，改成这个新值}} \tn 
% Row Count 6 (+ 4)
% Row 2
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{db.users.updateOne(\{name:"Cammy Soh"\}, \{\$set:{[}age:20，phoneNo: 97332212{]}\} )} \tn 
% Row Count 8 (+ 2)
% Row 3
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{db.users.updateMany({[}"hobbies .title":"sports"\}, \$set:fisSport:true{]}\})} \tn 
% Row Count 10 (+ 2)
% Row 4
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{db.users.updateOne(\{name:"Jayden Choi"\}, \{\$inc:\{age: 1\}\})} \tn 
% Row Count 12 (+ 2)
% Row 5
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{\seqsplit{报错，因为不能同时修改两个值：db}.user.updateOne(\{  name:"BAA" \}, \{\$inc:\{age:1\}, \$set:\{age:10\} \})} \tn 
% Row Count 15 (+ 3)
% Row 6
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{db.users.updateOne(\{ name:"abc" \}, \{\$min/\$max/\$mul: \{age:15\}\})} \tn 
% Row Count 17 (+ 2)
% Row 7
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{db.users.updateMany(\{isSport: true\}, \{\$unset: \{phone: " "\}\} )} \tn 
% Row Count 19 (+ 2)
% Row 8
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{db.users.updateMany(\{  \}, \{\$rename: \{age: "totalage"\}\} )} \tn 
% Row Count 21 (+ 2)
% Row 9
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{updateMany还有一个\{upsert=true\}函数，默认为false} \tn 
% Row Count 23 (+ 2)
% Row 10
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{db.users.updateMany(\{ hobbies:\{\$eleMatch: \{"frequency":\{\$gte:5\}, title:"sports"\}\}\}, \{\$set:\{"hobbies.\$": \{title:"sports", frequency:15\}\}\})} \tn 
% Row Count 26 (+ 3)
% Row 11
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{\$是指对那些满足筛选条件的第一个document更改值，\${[}{]}是对所有的更改值} \tn 
% Row Count 28 (+ 2)
% Row 12
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{db.users.updateMany(\{"hobbies.frequency":\{\$gt:3\}\},\{\$set:\{"hobbies.\$.goodFrequency":True\}\})新建立一个列} \tn 
% Row Count 31 (+ 3)
\end{tabularx}
\par\addvspace{1.3em}

\vfill
\columnbreak
\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{update (cont)}}  \tn
% Row 13
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{db.users.updateMany(\{\},\{\$set:\{"hobbies.\${[}el{]}.goodFrequency":true\}\}, \{arrayFilters:{[}\{"el.frequency":\{\$gt:3\}\}{]}\})} \tn 
% Row Count 3 (+ 3)
% Row 14
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{\seqsplit{最后一个参数告诉我们，第一个参数筛选的结果中，也不是所有的都需要改}} \tn 
% Row Count 5 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{group}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{db.users.aggregate({[}} \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{\{\$match:\{gender:"female"\}\},} \tn 
% Row Count 2 (+ 1)
% Row 2
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{\{\$group: \{\_id: \{isoWeekYear: \{ \$isoWeekYear: "\$date" \},incidentType: "\$incidentType"\}, totalAge:\{\$sum: "\$dob.age"\}\}\}} \tn 
% Row Count 5 (+ 3)
% Row 3
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{\{\$sort: \{totalPersons:-1\}\}。1是asc，-1desc，可以用之前groupby里面选中的列} \tn 
% Row Count 7 (+ 2)
% Row 4
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{\{\$project: \{\_id:0, gender:1, fullName:\{\$concat:{[}"hello,world"{]}{]}\}\}\}} \tn 
% Row Count 9 (+ 2)
% Row 5
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{\{addfields:\}首先，层层递进地加列，不要一次性计算很多，第二，如果要计算到之前加进去的列，需要新建一个addfields来算} \tn 
% Row Count 13 (+ 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}{字符串函数}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{\{\$toUpper,"\$name.first"\},\{\$toLower:"\$name.last"\}} \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{\$substrCP:{[}"\$name.first", 0 ,1{]} extracts starting from the 0 (1st) char for 1 char -\textgreater{} "B"} \tn 
% Row Count 3 (+ 2)
% Row 2
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{\$substrCP:{[}"\$name.first", 0 ,2{]} extracts starting from the 0 (1st) char for 2 char -\textgreater{} "Be"} \tn 
% Row Count 5 (+ 2)
% Row 3
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{\$subtract:{[}int1,int2{]} perform subtraction int1 – int2} \tn 
% Row Count 7 (+ 2)
% Row 4
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{\$strLenCP: \textless{}string\textgreater{} returns the length (number of char) of a string} \tn 
% Row Count 9 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{\seqsplit{projection中的array操作}}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{} \tn 
% Row Count 0 (+ 0)
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}


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

\end{document}