Software Development Exam > Software Development Questions > Consider the following SQL code:CREATE TABLE ...
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Consider the following SQL code:
CREATE TABLE Employees (
EmployeeID INT PRIMARY KEY,
FirstName VARCHAR(50),
LastName VARCHAR(50)
);
EmployeeID INT PRIMARY KEY,
FirstName VARCHAR(50),
LastName VARCHAR(50)
);
INSERT INTO Employees (EmployeeID, FirstName, LastName)
VALUES (1, 'John', 'Doe');
VALUES (1, 'John', 'Doe');
SELECT * FROM Employees;
What is the output of the above code?
- a)No output
- b)Error
- c)1, 'John', 'Doe'
- d)'John', 'Doe'
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
Consider the following SQL code:CREATE TABLE Employees ( EmployeeID IN...
The code creates a table named "Employees" with three columns: EmployeeID, FirstName, and LastName. It then inserts a single row into the table with values (1, 'John', 'Doe'). Finally, it selects all rows from the Employees table, which will return the inserted row: 1, 'John', 'Doe'.
Most Upvoted Answer
Consider the following SQL code:CREATE TABLE Employees ( EmployeeID IN...
Explanation:
The provided SQL code creates a table named "Employees" with three columns: EmployeeID, FirstName, and LastName. The EmployeeID column is defined as the primary key. Then, a single row of data is inserted into the table with the values (1, John, Doe). Finally, a SELECT statement is used to retrieve all rows from the Employees table.
Let's break down the code and its output:
1. CREATE TABLE Employees ( EmployeeID INT PRIMARY KEY, FirstName VARCHAR(50), LastName VARCHAR(50));
- This statement creates a table named "Employees" with three columns: EmployeeID, FirstName, and LastName.
- The EmployeeID column is defined as an INT data type and is set as the primary key.
- The FirstName and LastName columns are defined as VARCHAR(50), which means they can store up to 50 characters.
- This statement does not produce any output. It only creates the table structure.
2. INSERT INTO Employees (EmployeeID, FirstName, LastName) VALUES (1, John, Doe);
- This statement inserts a single row of data into the Employees table.
- The values provided are (1, John, Doe), which correspond to the EmployeeID, FirstName, and LastName columns, respectively.
- Since the EmployeeID column is the primary key, it must have a unique value for each row.
- This statement does not produce any output. It only inserts the specified row into the table.
3. SELECT * FROM Employees;
- This statement retrieves all rows and columns from the Employees table.
- The asterisk (*) is used as a wildcard character to indicate all columns.
- In this case, it will return the single row that was inserted in the previous step.
- The output of this statement would be the row (1, John, Doe) or 1, John, Doe.
Therefore, the correct answer is option 'c': 1, John, Doe.
The provided SQL code creates a table named "Employees" with three columns: EmployeeID, FirstName, and LastName. The EmployeeID column is defined as the primary key. Then, a single row of data is inserted into the table with the values (1, John, Doe). Finally, a SELECT statement is used to retrieve all rows from the Employees table.
Let's break down the code and its output:
1. CREATE TABLE Employees ( EmployeeID INT PRIMARY KEY, FirstName VARCHAR(50), LastName VARCHAR(50));
- This statement creates a table named "Employees" with three columns: EmployeeID, FirstName, and LastName.
- The EmployeeID column is defined as an INT data type and is set as the primary key.
- The FirstName and LastName columns are defined as VARCHAR(50), which means they can store up to 50 characters.
- This statement does not produce any output. It only creates the table structure.
2. INSERT INTO Employees (EmployeeID, FirstName, LastName) VALUES (1, John, Doe);
- This statement inserts a single row of data into the Employees table.
- The values provided are (1, John, Doe), which correspond to the EmployeeID, FirstName, and LastName columns, respectively.
- Since the EmployeeID column is the primary key, it must have a unique value for each row.
- This statement does not produce any output. It only inserts the specified row into the table.
3. SELECT * FROM Employees;
- This statement retrieves all rows and columns from the Employees table.
- The asterisk (*) is used as a wildcard character to indicate all columns.
- In this case, it will return the single row that was inserted in the previous step.
- The output of this statement would be the row (1, John, Doe) or 1, John, Doe.
Therefore, the correct answer is option 'c': 1, John, Doe.
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Consider the following SQL code:CREATE TABLE Employees ( EmployeeID INT PRIMARY KEY, FirstName VARCHAR(50), LastName VARCHAR(50));INSERT INTO Employees (EmployeeID, FirstName, LastName)VALUES (1, John, Doe);SELECT * FROM Employees;What is the output of the above code?a)No outputb)Errorc)1, John, Doed)John, DoeCorrect answer is option 'C'. Can you explain this answer?
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