**Using DECODE Function in Oracle Database for Customized Sorting**In Oracle database, if we have any date field such as a Date of Birth (DOB) field in any of our tables, we can use the DECODE function to sort the result based on our customized order.To achieve this, include the following in the ORDER BY clause:```DECODE(TO_CHAR(DOB,'DAY'), 'SUNDAY', 1, 'MONDAY', 2, 'TUESDAY', 3, 'WEDNESDAY', 4, 'THURSDAY', 5, 'FRIDAY', 6, 'SATURDAY', 7)```**Question:**This will generate the correct ordered result- ○ True- ○ False The table displayed shows the sales data for various branches, along with their corresponding ranks. The columns are labeled as follows: - **BRANCH_NO:** Branch number- **SALES:** Total sales amount- **RANK:** Rank according to salesThe data is as follows:- Branch 100 has sales of 35,007,880 and is ranked 1.- Branch 105 has sales of 33,658,205 and is ranked 1.- Branch 113 has sales of 28,680,995 and is ranked 1.- Branch 112 has sales of 25,414,340 and is ranked 1.- Branch 102 has sales of 20,175,110 and is ranked 2.- Branch 106 has sales of 18,802,065 and is ranked 2.- Branch 110 has sales of 16,087,795 and is ranked 2.- Branch 104 has sales of 14,439,605 and is ranked 2.- Branch 111 has sales of 13,796,770 and is ranked 3.- Branch 101 has sales of 11,957,615 and is ranked 3.- Branch 108 has sales of 11,520,520 and is ranked 3.- Branch 107 has sales of 11,467,615 and is ranked 3.- Branch 103 has sales of 9,939,950 and is ranked 4.- Branch 114 has sales of 9,036,135 and is ranked 4.- Branch 109 has sales of 1,646,200 and is ranked 4.The text below the table explains how the data can be ranked using a RANK function:"This can be done by including a RANK function:DENSE_RANK() OVER (order by sum(subtotal) desc) Rank"The exercise presented asks whether this statement is true or false, with options to select either:- True- FalseThis explanation covers the use of the DENSE_RANK function, which is used in SQL to assign ranks to rows without gaps in ranking values, based on descending order of a specified subtotal.

Answered: cle database, if we have any date field…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

**Using DECODE Function in Oracle Database for Customized Sorting**

In Oracle database, if we have any date field such as a Date of Birth (DOB) field in any of our tables, we can use the DECODE function to sort the result based on our customized order.

To achieve this, include the following in the ORDER BY clause:

```
DECODE(TO_CHAR(DOB,'DAY'),
'SUNDAY', 1,
'MONDAY', 2,
'TUESDAY', 3,
'WEDNESDAY', 4,
'THURSDAY', 5,
'FRIDAY', 6,
'SATURDAY', 7)
```

**Question:**

This will generate the correct ordered result

- ○ True
- ○ False

The table displayed shows the sales data for various branches, along with their corresponding ranks. The columns are labeled as follows:

- **BRANCH_NO:** Branch number
- **SALES:** Total sales amount
- **RANK:** Rank according to sales

The data is as follows:

- Branch 100 has sales of 35,007,880 and is ranked 1.
- Branch 105 has sales of 33,658,205 and is ranked 1.
- Branch 113 has sales of 28,680,995 and is ranked 1.
- Branch 112 has sales of 25,414,340 and is ranked 1.
- Branch 102 has sales of 20,175,110 and is ranked 2.
- Branch 106 has sales of 18,802,065 and is ranked 2.
- Branch 110 has sales of 16,087,795 and is ranked 2.
- Branch 104 has sales of 14,439,605 and is ranked 2.
- Branch 111 has sales of 13,796,770 and is ranked 3.
- Branch 101 has sales of 11,957,615 and is ranked 3.
- Branch 108 has sales of 11,520,520 and is ranked 3.
- Branch 107 has sales of 11,467,615 and is ranked 3.
- Branch 103 has sales of 9,939,950 and is ranked 4.
- Branch 114 has sales of 9,036,135 and is ranked 4.
- Branch 109 has sales of 1,646,200 and is ranked 4.

The text below the table explains how the data can be ranked using a RANK function:

"This can be done by including a RANK function:

DENSE_RANK() OVER (order by sum(subtotal) desc) Rank"

The exercise presented asks whether this statement is true or false, with options to select either:

- True
- False

This explanation covers the use of the DENSE_RANK function, which is used in SQL to assign ranks to rows without gaps in ranking values, based on descending order of a specified subtotal.

Expert Solution

Step 1

Description:

The first answer is false.

Because the Oracle DECODE function is used to search the value one by one.
In Oracle, the DECODE function lets us count procedural if-else logic to make the query.
For example:
The Oracle DECODE function returns a when a equals test to pass and returns b when b equals test to pass, etc.
TO_CHAR() is a function, it is used for typecasting like converting numeric or date to a character type.

If a user wants to sort the result then needs to use ORDER by clause either ASC or DESC.
Then the answer will become True.

Now, here the correct answer is false.

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