Table of Contents

- 1 How do I remove a repeating element from an array?
- 2 How can you remove duplicates in an array show with an example?
- 3 How do I remove all duplicates from a list?
- 4 How do I filter duplicates in SQL?
- 5 What is Rowid and Rownum in Oracle?
- 6 What is difference between Rownum and Row_number?
- 7 What rank means?
- 8 What is the difference between the rank () and the Dense_rank () functions?
- 9 What is rank function in SQL?
- 10 How can get second highest salary in SQL?

## How do I remove a repeating element from an array?

2) Remove Duplicate Element in Array using separate index

- public class RemoveDuplicateInArrayExample2{
- public static int removeDuplicateElements(int arr[], int n){
- if (n==0 || n==1){
- return n;
- }
- int j = 0;//for next element.
- for (int i=0; i < n-1; i++){
- if (arr[i] != arr[i+1]){

### How can you remove duplicates in an array show with an example?

For this week, I wanted to come up with multiple ways to remove duplicates within an array.

- filter() function removeDuplicates(array) { return array. filter((a, b) => array. indexOf(a) === b) };
- forEach() function removeDuplicates(array) { let x = {}; array. forEach(function(i) { if(!
- Set.

**Which function is used to remove duplicate values from an array?**

array_unique() function

**How do I get rid of repeats?**

Remove duplicate values

- Select the range of cells that has duplicate values you want to remove. Tip: Remove any outlines or subtotals from your data before trying to remove duplicates.
- Click Data > Remove Duplicates, and then Under Columns, check or uncheck the columns where you want to remove the duplicates.
- Click OK.

## How do I remove all duplicates from a list?

To remove the duplicates from a list, you can make use of the built-in function set(). The specialty of the set() method is that it returns distinct elements. You can remove duplicates from the given list by importing OrderedDictfrom collections.

### How do I filter duplicates in SQL?

The go to solution for removing duplicate rows from your result sets is to include the distinct keyword in your select statement. It tells the query engine to remove duplicates to produce a result set in which every row is unique. The group by clause can also be used to remove duplicates.

**How do I remove duplicates from one column in SQL?**

To remove the duplicates, the database system first sorts the result set by every column specified in the SELECT clause. It then scans the table from top to bottom to identify the duplicates that are next to each other.

**How do I find duplicate rows in SQL based on one column?**

Find duplicate values in one column

- First, use the GROUP BY clause to group all rows by the target column, which is the column that you want to check duplicate.
- Then, use the COUNT() function in the HAVING clause to check if any group have more than 1 element. These groups are duplicate.

## What is Rowid and Rownum in Oracle?

ROWNUM is representative of the sequence allocated to any data retrieval bunch. ROWID is the permanent identity or address of a row. ROWNUM is a temporarily assigned sequence to a row. The output of ROWID is the physical address of a row. The output of ROWNUM is the sequence number of a row.

### What is difference between Rownum and Row_number?

ROWNUM is the sequential number, allocated to each returned row during query exectuion. ROW_NUMBER assigns a number to each row according to its ordering within a group of rows. ROW_NUMBER is a function that returns numeric value.

**Which is better rank or Dense_rank?**

RANK gives you the ranking within your ordered partition. Ties are assigned the same rank, with the next ranking(s) skipped. So, if you have 3 items at rank 2, the next rank listed would be ranked 5. DENSE_RANK again gives you the ranking within your ordered partition, but the ranks are consecutive.

**What is difference between rank () Row_number () and Dense_rank () in Oracle?**

The row_number gives continuous numbers, while rank and dense_rank give the same rank for duplicates, but the next number in rank is as per continuous order so you will see a jump but in dense_rank doesn’t have any gap in rankings.

## What rank means?

The noun rank refers to a position within a hierarchy, and to rank something is to put it in order — for example, your high school might rank students in terms of their GPAs. You can also use rank to describe an especially foul smell, like the rank gym shoes in the back of your closet.

### What is the difference between the rank () and the Dense_rank () functions?

RANK() will assign the same number for the row which contains the same value and skips the next number. DENSE_RANK () will assign the same number for the row which contains the same value without skipping the next number. RANK and DENSE_RANK both return four again because both rows four and five are ranked the same.

**What is difference between Row_number and rank?**

The difference between RANK() and ROW_NUMBER() is that RANK() skips duplicate values. When there are duplicate values, the same ranking is assigned, and a gap appears in the sequence for each duplicate ranking.

**What type of values are ignored by count (*) function?**

Explanation: The count(*) aggregation function ignores null values while calculating the number of values in a particular attribute.

## What is rank function in SQL?

The RANK() function is a window function could be used in SQL Server to calculate a rank for each row within a partition of a result set. The same rank is assigned to the rows in a partition which have the same values. The rank of the first row is 1.

### How can get second highest salary in SQL?

How To Find Second Highest Salary Using a Sub-Query

- SELECT TOP 1 SALARY.
- FROM (
- SELECT DISTINCT TOP 2 SALARY.
- FROM tbl_Employees.
- ORDER BY SALARY DESC.
- ) RESULT.
- ORDER BY SALARY.

**How do you find top 5 salary in SQL?**

Solution 13

- SELECT MAX(salary) FROM employee;
- SELECT MAX(slary), dept_id from employee group by dept_id;
- select distinct salary from employee order by salary desc limit 5;
- select distinct salary, dept_id from employee order by salary desc limit 5;

**What is difference between aggregate and analytic function?**

Aggregate functions perform a calculation on a set of values and return a single value. Analytic functions compute an aggregate value based on a set of values, and, unlike aggregate functions, can return multiple rows for each set of values.