MCQ IN COMPUTER SCIENCE & ENGINEERING

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COMPUTER SCIENCE AND ENGINEERING

SQL

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
What will be the output of this query?SELECT * FROM employees;
A
Retrieve all rows in the employee database
B
Retrieve all rows from the employee table
C
Retrieve all columns from the employee database
D
Retrieve all columns from employee table
Explanation: 

Detailed explanation-1: -An SQL SELECT statement retrieves records from a database table according to clauses (for example, FROM and WHERE ) that specify criteria.

Detailed explanation-2: -The * operator represents all the columns of a table. So, you don’t need to specify each column name in the SELECT query to get data from all the columns. SELECT * FROM Employee; The above query returns all the rows and columns data from the Employee table, as shown below.

Detailed explanation-3: -The SQL SELECT statement is used to retrieve records from one or more tables in your SQL database.

Detailed explanation-4: -Syntax of SELECT query SELECT query is used to retieve records from a table. We can specify the names of the columns which we want in the resultset.

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