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$featured_image_url = wp_get_attachment_url( get_post_thumbnail_id( get_the_ID() ) );
if  ( ! empty( $featured_image_url ) ) {

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//scroll back to the top of screen button
if ($('#back-to-top').length) {
	var scrollTrigger = 100, // px
	backToTop = function () {
		var scrollTop = $(window).scrollTop();
		if (scrollTop > scrollTrigger) {
			$('#back-to-top').addClass('show');
		} else {
			$('#back-to-top').removeClass('show');
		}

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MySQL

Getting started:

• http://www.sqlteaching.com/
• https://www.codecademy.com/courses/learn-sql

Related tutorials:

• MySQL-CLI: https://www.youtube.com/playlist?list=PLfdtiltiRHWEw4-kRrh1ZZy_3OcQxTn7P
• Analyzing Business Metrics: https://www.codecademy.com/learn/sql-analyzing-business-metrics

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<?php
/**
 * Convert a comma separated file into an associated array.
 * The first row should contain the array keys.
 * 
 * Example:
 * 
 * @param string $filename Path to the CSV file
 * @param string $delimiter The separator used in the file
 * @return array