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Android emulator shows nothing except black screen and adb devices shows “device offline”
...at runs emulators through team viewer. In Android Studio 2.0, this option appears in the downward arrow next to the edit button -> "Wipe Data"
– behelit
Apr 12 '16 at 7:13
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A migration to add unique constraint to a combination of columns
What I need is a migration to apply unique constraint to a combination of columns. i.e. for a people table, a combination of first_name , last_Name and Dob should be unique.
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UIGestureRecognizer on UIImageView
...o the actual zoom/rotate yourself in the gesture handlers. See the sample app Touches_GestureRecognizers on how to do the zoom/rotate.
– user467105
Oct 11 '10 at 21:27
77
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React.js: Identifying different inputs with one onChange handler
Curious what the right way to approach this is:
11 Answers
11
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Fast way to discover the row count of a table in PostgreSQL
...acy depends on more factors:
Distribution of row size. If a given block happens to hold wider than usual rows, the count is lower than usual etc.
Dead tuples or a FILLFACTOR occupy space per block. If unevenly distributed across the table, the estimate may be off.
General rounding errors.
In mos...
How to install Xcode Command Line Tools
...o longer available through Xcode. Instead they must be downloaded from the Apple Developer Tools site: https://developer.apple.com/downloads/index.action. This requires signing in with a developer account.
Or via terminal (from the release docs): The Command Line Developer Tools package can be inst...
DLL and LIB files - what and why?
... the library code into your program when it is compiled, it can be run by mapping it into your program as it is loaded into memory. Multiple programs running at the same time that use the same functions can all share one copy, saving memory. In fact, you can load dynamic libraries only as needed, de...
What is the difference between __dirname and ./ in node.js?
... Is there any way to reference the working directory of the app with fs? For example, I'm trying to load a file from the working directory /movies, but since my module is in a file /custom_modules/, __dirname tries to grab the movie from , /custom_modules/movies
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What does “Document-oriented” vs. Key-Value mean when talking about MongoDB vs Cassandra?
...e page's data with a single query and are well suited for content oriented applications (which is why big sites like Facebook or Amazon like them).
Other kinds of NoSQL databases include column-oriented stores, graph databases and even object databases. But this goes beyond the question.
See also
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How to let PHP to create subdomain automatically for each user?
...method to connect to the customers database for a multi-company e-commerce application, but it may work for you as well.
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