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Which query will give the following result when it is applied to the original table?

Result table:
\begin{tabular}{|c|c|}
\hline
Name & Age \\
\hline
Joe & 24 \\
\hline
Frank & 20 \\
\hline
\end{tabular}

Original table:
\begin{tabular}{|c|c|c|}
\hline
\multicolumn{3}{|c|}{Table 1} \\
\hline
Name & Age & Gender \\
\hline
Mary & 22 & female \\
\hline
Joe & 24 & male \\
\hline
Kate & 21 & female \\
\hline
Frank & 20 & male \\
\hline
\end{tabular}

A. SELECT FROM "Table1" WHERE ("Name" = 'Joe' AND "Name" = 'Frank')

B. SELECT FROM "Table1" WHERE ("Gender" = 'male')

C. SELECT "Name", "Age" FROM "Table1" WHERE ("Gender" = 'male')

D. SELECT "Name" FROM "Table1" WHERE ("Name" = 'Joe' AND "Name" = 'Frank')

E. SELECT * FROM Table1

Sagot :

GinnyAnsweridn
To identify the correct SQL query that will generate the specified result table from the original table, let's carefully analyze each of the given options.

Original Table:

[tex]\[ \begin{array}{|c|c|c|} \hline Name & Age & Gender \\ \hline Mary & 22 & female \\ \hline Joe & 24 & male \\ \hline Kate & 21 & female \\ \hline Frank & 20 & male \\ \hline \end{array} \][/tex]

Expected Result Table:

[tex]\[ \begin{array}{|c|c|} \hline Name & Age \\ \hline Joe & 24 \\ \hline Frank & 20 \\ \hline \end{array} \][/tex]

Let's analyze each SQL query option to determine which one correctly generates the expected result table:

Option A: `SELECT ' FROM "Table1" WHERE ("Name" = 'Joe' AND "Name" = 'Frank')`
- This option is invalid because the condition "Name" = 'Joe' AND "Name" = 'Frank' can never be true simultaneously. A single row cannot have both names.

Option B: `SELECT [tex]$\cdot$[/tex] FROM "Table1" WHERE ("Gender" = 'male')`
- This query will select all columns for rows where Gender is 'male'. The result will be:

[tex]\[ \begin{array}{|c|c|c|} \hline Name & Age & Gender \\ \hline Joe & 24 & male \\ \hline Frank & 20 & male \\ \hline \end{array} \][/tex]

- This result table includes the Gender column, which is not what we want. Therefore, this option is incorrect.

Option C: `SELECT "Name", "Age" FROM "Table1" WHERE ("Gender" = 'male')`
- This query will select only the Name and Age columns for rows where Gender is 'male'. The resulting table will be:

[tex]\[ \begin{array}{|c|c|} \hline Name & Age \\ \hline Joe & 24 \\ \hline Frank & 20 \\ \hline \end{array} \][/tex]

- This matches exactly with our expected result table. Therefore, this option is correct.

Option D: `SELECT "Name" FROM "Table1" WHERE ("Name" = 'Joe' AND "Name" = 'Frank')`
- Similar to Option A, the condition "Name" = 'Joe' AND "Name" = 'Frank' cannot be true simultaneously, so this query would return no rows. This option is incorrect.

Option E: `SELECT' FROM Table1`
- This query is syntactically incorrect, as it does not specify which columns to select and has a misplaced single quote.

Based on the analysis, the correct option is:

C. SELECT "Name", "Age" FROM "Table1" WHERE ("Gender" ='male')
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