Top n distinct values of one column in Oracle
问题: I'm using a query where a part of it gets the top 3 of a certain column. It creates a distinct subquery of the column, limited by 3 number of rows, and then filters those...
MySQL from last specific month
问题: I have database with toners. I need to get result only from lastest spetember every year to currrent date. SELECT * FROM used_toners WHERE date >= '01-09-2018' # but a...
Comparing two lists and fetching child objects
问题: I have 2 lists. One, with just the parent Objects and the other which may have its child objects. Since these lists can be huge, I needed a way to fetch just the child o...
how to calculate current system time and store time interval
问题: I want to calculate current system time and store time interval. I am using admob in my application. When a user clicks on ads I want to store current time in sharedPrefere...
How not to use escape character in java
问题: I have to use " in a string but apparently, I cant. To be more specific I need to do something like: Let's say the string is something like: I like cookie's "%s" str =...
Cannot resolve method Character::hashCode in a Java stream
问题: In my example, I try to create an ASCII table from a sequence of characters. I managed to do it with a List of strings but failed with an array of chars. I get an error...
Warning messages on publishing publishing codename one app via Google play console Start To Roll Out Button disabled
问题: On publishing the codename one app via the google play console I get the warning messages and the Start To roll Out To Production is then disabled. the first warning mess...
How to navigate to activity located in different module
问题: I am working on application which is divided by features into modules. App structure looks like so: app (application) MainActivity MainApplication...
Orbit slider fails to animate after adding DOM element dynamically
问题: I basically have a slider on my page which runs fine as soon as it loads. The issue presents itself when I reload orbit-container after DOM loads and appending new data....
How to adjust scrolling speed in jQuery
问题: I want to make a <div> scrollable by dragging it but it scrolls too fast. It feels like it is scrolling 2 times faster than normal. I want it to scroll exactly the sa...
vue.js pagination mis calculation
问题: In my app, I have some pagination code which calculates the pagination based on data from a REST API. When I add the page of pages, it is calculating from page 0 not from 1...
Render as undefined, can't quite figure out the bug
问题: I am wrapping up a personal project and testing for any bug, I fixed the majority bug and can't quite figure out how to resolve this one, which outputs the right counts, un...
Net Core: How to create CSS with TagBuilder?
问题: How do I use Tag Builder CSS Class? I want to incorporate this in a style class img { max-width: 100%; max-height: 100%; padding: 0px; background-color:white; } TagBui...
What is app instance in firebase project? Is it app by unique users or an app?
问题: I'm creating an android application using firebase cloud messaging. I'm using the concept of the topic of it. I have read the firebase developer page to know about how many...
How can I set data from position X to position Y inside child on particular group in ExpandListView?
问题: Problem: I have arraylist which contains all child items which is 5 child, now I have to divide into two group: General and other. For General (3) Ele bill, Insurance and...
is this wrong Teacher.prototype = Person.prototype?
问题: i just was reading an article about oojs in MDN the article, and it mentioned you should use Teacher.prototype = Object.create(Person.prototype); I just was wonde...
Error in sql sintaxis near the use SELECT, code: 'ER_PARSE_ERROR', errno: 1064
问题: I 'm having an error in an sql query. I get the therror: code: 'ER_PARSE_ERROR', errno: 1064. I tried copying and pasting it directly to the database and it worked perfec...
Browser game protection
问题: I have simple JavaScript game with server on node.js. For login I use JWT token. Everything is working well, but I have one problem. If the user changes the position, var...
what is difference between working of keyup and keydown in javascript?
问题: I have been just learning the keypress events in javascript and wonder why do i get different result in keyup and keydown. for eg. if i assign an input with an id and pass...
Left Join on same table multiples times with 2 ids with MySQL
问题: I have this SQL request: SELECT mailbox.*, user.picture, user.firstname, user.lastname FROM mailbox LEFT JOIN user ON user.id = mailbox.sender_id WHERE mailbox.se...
今天,有什么经验需要分享呢?
立即撰写