When user trying to manipulation on WordPress Database using $wpdb class, the following error or similar error may appear:
WordPress database error: [You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near…]
One of the reasons for the errors is caused by post_ID or ID variable that represents the ID of the wordpress post. Depending on which version of PHP, MySQL or wordpress you are using.
The $post_id or $id or $post->ID can be placed within single quote (‘) as the workaround or resolution to avoid or solve the error.