limit

问题 Problem: I have a list of names and addresses. Some names (persons) have the same address (street, zip code, town) like others. I want to select all those names with addresses with no more than three occurrences and from the rest the first three names each of a bunch pointing to the same address. Example: Albert | Adr1 Berta | Adr1 Cesar | Adr1 Donald | Adr1 Eric | Adr2 Fritz | Adr2 Gerd | Adr2 Henry | Adr3 The result set should be Albert | Adr1 Berta | Adr1 Cesar | Adr1 Eric | Adr2 Fritz |

问题 I'm writing an interpreter for a game. User enters its move to the interpreter and program executes that move. Now I want to implement a time limit for each decision. Player shouldn't be able to think more than 30 seconds to write a move and press enter. call_with_time_limit seemed relevant but it doesnt work properly as such: call_with_time_limit( 30, read(X) ), Problem, write(Problem). In this case, it waits for input, and when input is entered, timer starts afterwards. But I want the timer

问题 I'm building an application that might have heavy offline storage needs, and I was wondering if it's possible to use both an offline cache manifest (5MB) as well as localstorage (5MB) to be able to use 10MB of storage. Note that this is an intranet application, so we have control of the devices. 回答1: I have tested this in Chrome, Firefox, Opera and Safari and all browser use for both technique a limit of 5 mb. So it's possible... Note: - The limit of localStorage and Offline Application

问题 Can I set maximum size for an actor's mailbox in Scala? Take the Producer-Consumer problem. With threads I can block the producers when the buffer fills up. I saw a couple of producer-consumer examples written in Scala and they all use actors with mailboxes used as a "buffer". Can I set mailbox size to cause producers to wait until a consumer is ready? Any other elegant solution to avoid uncontrollable growth of mailboxes? 回答1: You can create an actor that acts as a buffer between the

问题 I just started learning my first real programming language, Python. I'd like to know how to constrain user input in a raw_input to certain characters and to a certain length. For example, I'd like to show an error message if the user inputs a string that contains anything except the letters a-z , and I'd like to show one if the user inputs more than 15 characters. The first one seems like something I could do with regular expressions, which I know a little of because I've used them in

问题 Suppose Table X has a 100 tuples. Will the following approach to scanning X generate all the tuples in TABLE X, in MySQL? for start in [0, 10, 20, ..., 90]: print results of "select * from X LIMIT start, 10;" I ask, because I've been using PostgreSQL, which clearly says that this approach need not work, but there seems to be no such info for MySQL. If it won't, is there a way to return results in a fixed ordering without knowing any other info about the table (like what the primary key fields

问题 I have a SPARQL query which returns result with a LIMIT of 20.. In this query I also want to know the total number of results without running the query two times (one with LIMIT and one without LIMIT ).. For Example-- On running a query total possible results are 500 with LIMIT it displays only 20 at a time, but in my response I want a field which displays total result count, i.e., 500 ... Updated question Suppose Now if i do a query where sequence = abc_11 with LIMIT=2 I will get something

问题 I have this mysql query: SELECT Files.GUID, Files.Name, Files.Type, Files.Visibility, Files.CreationDate, Files.OwnerUser, Date, BackupsCount FROM Files LEFT JOIN ( SELECT FileGUID, Date, COUNT(*) AS BackupsCount FROM Versions GROUP BY FileGUID ) Versions ON Files.GUID = Versions.FileGUID WHERE Files.ParentFolder = '96251A8B-B2A8-416B-92D7-3509E6A645C7' ORDER BY Files.Type DESC, CreationDate ASC LIMIT 0, 50 I'd like to know how many record this query would return if the LIMIT directive was

问题 I didn't find the answer by search. I thought I should be able to create many stored access policies on one container (at least thousands). But by tests, my program can only add up to 5 policies on one container. Then I tried Microsoft Azure Storage Explorer, it also has this restriction, can add only up to 5. But I cannot find any description about this. Is there any way to remove this restriction? Thanks. 回答1: The access policy limit is indeed 5 stored access policies per container, file

问题 I am making an app for iOS using mapkit. I want to limit the boundaries of the map only to a specific region/country. Is there a way to do this? 回答1: There's no way to tell the map not to scroll out of a certain area. The only way I could think to do it would be to stop the user from scrolling when you hit one of your fences. The example below is written without testing or compiling at all so you may need to tweek it yourself but hopefully it'll get you started.. ViewController.h