Which among the following can also be included with "SELECT" clause while writing query in Mysql?

Solution (By Examveda Team)

This question asks about what can be included with the SELECT clause in a MySQL query. The SELECT clause is used to specify the columns or data you want to retrieve from your database.
Let's break down the options:
Option A: Literals
Literals are constant values, like numbers (e.g., 10, 3.14), text (e.g., "Hello"), or dates (e.g., '2024-03-15'). You can definitely use literals in your SELECT clause. For example:
```sql SELECT 'Hello World!', 10; ```
Option B: Expressions
Expressions are combinations of values, operators, and functions that calculate a result. You can use these in your SELECT clause too. For example:
```sql SELECT price * quantity AS total_cost; ```
Option C: User-defined functions
User-defined functions are functions you create to perform specific tasks within your database. You can use them in the SELECT clause as well. For example:
```sql SELECT calculate_discount(price) AS discounted_price; ```
Option D: All of the mentioned
Since literals, expressions, and user-defined functions can all be used with the SELECT clause, this option is the correct answer.
In short, the SELECT clause is versatile and lets you use a variety of elements to retrieve data from your database in various ways.