[Solved] Delete all rows except the one with the biggest value

DELETE FROM `transactions` WHERE id NOT IN ( SELECT MAX(id) FROM `transactions` group by user_id ) The inner query groups by each user and select only the highest ID for each. Delete all records except the IDs from the inner select. 0 solved Delete all rows except the one with the biggest value

[Solved] How to use strtok in string?

The cause of the problem: The function strtok() has many problems, due to the fact that subsequent calls depend on previous calls, and this dependency is managed in an unsafe manner: it’s not thread safe (see Robert’s comment, and C++ standard section 21.8 pt 14) if one function you call would use strtok() without you … Read more

[Solved] How to make this c# code small or refactor this code [closed]

All your iterations can be joined together, therefore executed in one run like: ArrayList groupA = new ArrayList(); ArrayList groupB = new ArrayList(); ArrayList groupC = new ArrayList(); ArrayList groupD = new ArrayList(); ArrayList groupE = new ArrayList(); ArrayList groupF = new ArrayList(); ArrayList groupG = new ArrayList(); ArrayList groupH = new ArrayList(); for (int … Read more

[Solved] Why does this code hang on reaching the first ReadLine from a StreamReader?

I think you should return to basics: public static string SendXMLFile(string xmlFilepath, string uri, int timeout) { using (var client = new WebClient()) { client.Headers.Add(“Content-Type”, “application/xml”); byte[] response = client.UploadFile(uri, “POST”, xmlFilepath); return Encoding.ASCII.GetString(response); } } and see what works and what the server thinks of your file. When you really need a TimeOut then … Read more

[Solved] Codeigniter wrong url to redirect 404

Try this public function read($slug_posts) { $options = $this->options_model->listing(); $posts = $this->posts_model->read($slug_posts); if ( ! $posts) { show_404(); } #$listing = $this->posts_model->home(); $data = array( ‘title’ => $posts->post_title.’ – ‘.$options->option_title, ‘description’ => $posts->post_description, ‘posts’ => $posts, #’listing’ => $listing, ‘content’ => ‘posts/read’ ); $this->load->view(‘layout/wrapper’, $data, FALSE); } If truly understand what your question is, this … Read more

[Solved] java string to class and call mathod

First you have to know the name of the package containing the class. If you know it, you can try the following: String className = packageName + “.Test”; Class cls = Class.forName(className); cls.getMethod(“main”, String[].class).invoke(null); Note that, if the class is in (default) package then you can use “Test” as className without the package name. 2 … Read more

[Solved] compare two big strings with javascript [closed]

You can try to use MD5 hashes of long strings. MD5 (Message-Digest algorithm 5) is a widely-used cryptographic hash function with a 128-bit hash value. MD5 has been employed in a wide variety of security applications, and is also commonly used to check the integrity of data. The generated hash is also non-reversable. Data cannot … Read more