Page 40 - Modular_V2.0_SQL_Flipbook

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MORE ON MYSQL

Your Aim

to learn about:
Aliasing Performing Calculations in Queries
Using Group By Using Order By
Function

In the previous chapter, you have learnt about different types of queries like insert, update and

delete. In this chapter, you will learn about more about them.

ALIASING

Aliases are used to give a table or column, a temporary name. Aliases are often used to make column
names more readable and presentable. An alias only exists for the duration of that query. It’s not
permanent. Its impact remains during query execution. Alias is valid during the scope of the statement.
For example, consider the following table named STUDENTS:
Name

Stu_id Stu_name Age Class Marks
101 Rahim 18 XII 87
102 Raja 19 XII 66
103 Riya 18 XII 55

SELECT Stu_name as name, Stu_id as id FROM STUDENTS;
+-------+------+
| name |id |
+-------+------+
| Rahim | 1001 |
+-------+------+
| Raja | 102 |
+-------+------+
| Riya | 103 |
+--------------+
This query will help in displaying results more clear and understandable. The Name and Admission
number will be visible during Query results.

SELECT (Marks *0.20) as "New Marks" FROM STUDENTS WHERE Marks > 60;

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