错误缺失{插入

错误缺失{插入
\textbf{47.Consider the following relations:\\
\includegraphics[width=120mm]{Image6.png}\\
Consider the following SQL query.\\ 
SELECT S.Student$_$Name, sum (P.Marks)\\ 
FROM Student S,Performance P\\
WHERE S.Roll$_$No=P.Roll$_$No \\
GROUP BY S.Student$_$Name\\ 
The number of rows that will be returned by the SQL query is .........}\\
\vspace{2mm}\\

错误缺少{插入....请帮帮我!

答案1

_在数学模式中,要求将参数放入下标位置。使用\_\textunderscore代替$_$

SELECT S.Student\_Name

或者逐字使用:

\verb|S.Student_Name|

listings代码清单包

或者 ...

扫描时文件结束使用\textbf

}行中缺少结尾\textbf。更正:

\textbf{47.Consider the following relations:}\\

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