WordPress database error: [Got error 28 from storage engine]
SHOW COLUMNS FROM how2_learnpress_user_items LIKE 'parent_id'

WordPress database error: [Duplicate column name 'parent_id']
ALTER TABLE how2_learnpress_user_items ADD COLUMN `parent_id` BIGINT(20) UNSIGNED NOT NULL DEFAULT 0 AFTER `ref_type`;


Warning: mysqli_query(): (HY000/1030): Got error 28 from storage engine in /home/how2dodigital/public_html/wp-includes/wp-db.php on line 1942

WordPress database error: [Got error 28 from storage engine]
SELECT SQL_CALC_FOUND_ROWS u.*, c.comment_ID as comment_id, cm1.meta_value as title, c.comment_content as content, cm2.meta_value as rate FROM how2_posts p INNER JOIN how2_comments c ON p.ID = c.comment_post_ID INNER JOIN how2_users u ON u.ID = c.user_id INNER JOIN how2_commentmeta cm1 ON cm1.comment_id = c.comment_ID AND cm1.meta_key = '_lpr_review_title' INNER JOIN how2_commentmeta cm2 ON cm2.comment_id = c.comment_ID AND cm2.meta_key = '_lpr_rating' WHERE p.ID = 8565 AND c.comment_type = 'review' AND c.comment_approved = 1 ORDER BY c.comment_date DESC LIMIT 0, 5

Explained - Difference between Broad Match and Broad Match Modifier

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