nylen/README.md

## README.md

      
    Raw
  

              README.md
            
          
    When running WordPress or ClassicPress using a DigitalOcean managed MySQL database you may experience errors like the following:

Expression #1 of ORDER BY clause is not in GROUP BY clause and contains nonaggregated column 'dbname.wp_posts.post_date' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by for query SELECT YEAR(post_date) AS `year`, MONTH(post_date) AS `month`, count(ID) as posts FROM wp_posts  WHERE post_type = 'post' AND post_status = 'publish' GROUP BY YEAR(post_date), MONTH(post_date) ORDER BY post_date DESC  made by require('wp-blog-header.php'), require_once('wp-includes/template-loader.php'), include('/themes/themename/404.php'), the_widget, WP_Widget_Archives->widget, wp_get_archives
Expression #1 of ORDER BY clause is not in SELECT list, references column 'dbname.wp_posts.post_date' which is not in SELECT list; this is incompatible with DISTINCT for query SELECT DISTINCT YEAR( post_date ) AS year, MONTH( post_date ) AS month FROM wp_posts WHERE post_type = 'attachment' ORDER BY post_date DESC made by wp_enqueue_media

More information including a suggested core patch is available at https://core.trac.wordpress.org/ticket/48377. In the meantime you can drop the mysql-no-ansi.php file into the wp-content/mu-plugins/ folder of your site to fix this issue, or add the code into your theme's functions.php file.

  
## mysql-no-ansi.php
<?php

if ( ! defined( 'ABSPATH' ) ) {
	return;
}

add_filter( 'incompatible_sql_modes', function( $incompatible_modes ) {
	$incompatible_modes[] = 'ANSI';
	return $incompatible_modes;
} );

$GLOBALS['wpdb']->set_sql_mode();
	<?php

	if ( ! defined( 'ABSPATH' ) ) {
	return;
	}

	add_filter( 'incompatible_sql_modes', function( $incompatible_modes ) {
	$incompatible_modes[] = 'ANSI';
	return $incompatible_modes;
	} );

	$GLOBALS['wpdb']->set_sql_mode();