What is the difference between Views and Materialized Views in Oracle?
Materialized views are disk based and are updated periodically based upon the query definition. Views are virtual only and run the query definition each time they are accessed.
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How do I open a Visual Studio project in design view?
You can double click directly on the .cs file representing your form in the Solution Explorer : This will open Form1.cs [Design], which contains the drag&drop controls. If you are directly in the code behind (The file named Form1.cs, without “[Design]”), you can press Shift + F7 (or only F7 depending on the project type) instead to open it. From the design view, you can switch back … Read more
Check if an object exists
Since filter returns a QuerySet, you can use count to check how many results were returned. This is assuming you don’t actually need the results. After looking at the documentation though, it’s better to just call len on your filter if you are planning on using the results later, as you’ll only be making one sql query: A count() call … Read more
How do I format datetime in rails?
Use ruby’s strftime() on dates/datetimes: Have a look at the documentation to find out how the formatting works.
Rotating a view in Android
API 11 added a setRotation() method to all views.
Difference between View and table in sql
A table contains data, a view is just a SELECT statement which has been saved in the database (more or less, depending on your database). The advantage of a view is that it can join data from several tables thus creating a new view of it. Say you have a database with salaries and you need to … Read more
Getting activity from context in android
From your Activity, just pass in this as the Context for your layout: Afterwards you will have a Context in the layout, but you will know it is actually your Activity and you can cast it so that you have what you need:
SwiftUI – How do I change the background color of a View?
Screen’s Background Color (As of Xcode Version 13) I’m not sure if the original poster meant the background color of the entire screen or of individual views. So I’ll just add this answer which is to set the entire screen’s background color. Using ZStack I added .ignoresSafeArea() otherwise, it will stop at safe area margins. Using Overlay … Read more
Couchbase query using “\uefff” break the next conditional keys
If you need to filter your results by 2 varying ranges you can use LinQ, but if you have large number of documents it can be slow. So to make it faster you can do two things: After applying LinQ “filter” cache results in memcached or couchbase. If your datamodel allows you to create separate … Read more