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unnest in postgresql

Uninterested Unicorn answered on December 7, 2024 Popularity 1/10 Helpfulness 1/10

answer unnest in postgresql

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unnest in postgresql

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In 'postgresql' the purpose of 'UNNEST' is to transform a single row array 
into multiple rows, where each row corresponds to an element of the array.

Example: Table-students
| student_id | name | subjects |
|---------|------|----------| 
| 1 | Alice  | {Math, Science} | 
| 2 | Bob | {History, Art, Music} | 
| 3 | Charlie | {Math, Literature} |

SELECT student_id, name, UNNEST(subjects) AS subject FROM students;

'The result' of this query would be:

| student_id | name | subject |
|------------|---------|-----------| 
| 1 | Alice | Math | 
| 1 | Alice | Science | 
| 2 | Bob | History | 
| 2 | Bob | Art | 
| 2 | Bob | Music | 
| 3 | Charlie | Math | 
| 3 | Charlie | Literature |

Popularity 1/10 Helpfulness 1/10 Language sql

Source: Grepper

Tags: postgresql sql unnest

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Contributed on Dec 08 2024

Uninterested Unicorn

0 Answers Avg Quality 2/10

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dynamic add remove text field in javascript

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<!DOCTYPE html>
<html>
 
<head>
  <title>How to add remove dynamic text field in jquery</title>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.4.0/jquery.min.js"></script>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery-validate/1.19.1/jquery.validate.min.js"></script>
  <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.5.0/css/bootstrap.min.css" />
</head>
 
<body class="container">
  <div class="row mt-3">
	<div class="form-group optionBox">
		<div class="row">
			<div class="col-md-12">
				<div class="block">
					<div class="input-group" style="margin-bottom:8px;"  id="1">
						<input type="text" name="btn_label[]" class="form-control btn_label" placeholder="Add Button Label">
						<span class="input-group-btn"> 
							<button type="button"  class="btn btn-primary addButton">+</button> 
						</span>
					</div>
				</div>
			</div>
		</div>
	</div>
  </div>
</body>

<script>
	var i=1;
	$('.addButton').click(function() {
		i++;
		var html='<div class="input-group" style="margin-bottom:8px;"><input type="text" name="btn_label[]" class="form-control btn_label" placeholder="Add Button Label" value=""><span class="input-group-btn"><button type="button"  class="btn btn-primary remove">-</button> </span></div>';
		$('.block:last').after('<div class="block" id="'+i+'">'+html+'</div>');
	});
	
	$('.optionBox').on('click','.remove',function() {
		var id=$(this).parent().parent().attr("id");
		//alert(id);
		$(this).parent().parent().remove();
	});
</script>
 
</html>

Popularity 2/10 Helpfulness 1/10 Language php

Source: programmerdesk.com

Tags: dynamic text add php javascript field

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Contributed on Dec 07 2024

Navneet Dudhagara

0 Answers Avg Quality 2/10

unnest in postgresql

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