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Change One Cell's Data in mysql

How can I change the data in only one cell of a mysql table. I have problem with UPDATE because it makes all the parameters in a column change but I want only one changed. How? ...
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Scanner vs. BufferedReader

As far I know, the two most common methods of reading character-based data from a file in Java is using Scanner or BufferedReader . I also know that the BufferedReader reads files efficiently by using a buffer to avoid physical disk operations. ...
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MSSQL Error 'The underlying provider failed on Open'

I was using an .mdf for connecting to a database and entityClient . Now I want to change the connection string so that there will be no .mdf file. ...
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Adding n hours to a date in Java?

How do I add n hours to a Date object? I found another example using days on StackOverflow, but still don't understand how to do it with hours. ...
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PHPUnit assert that an exception was thrown?

Does anyone know whether there is an assert or something like that which can test whether an exception was thrown in the code being tested? ...
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dispatch_after - GCD in Swift?

I've gone through the iBook from Apple, and couldn't find any definition of it: 24 Answers ...
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What is hashCode used for? Is it unique?

I notice there is a getHashCode() method in every controls, items, in WP7, which return a sequence of number. Can I use this hashcode to identify an item? For example I want to identify a picture or a song in the device, and check it whereabout. This could be done if the hashcode given for specifi...
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What does it mean by select 1 from table?

I have seen many queries with something as follows. 15 Answers 15 ...
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How to present a simple alert message in java?

Coming from .NET i am so used calling Alert() in desktop apps. However in this java desktop app, I just want to alert a message saying "thank you for using java" I have to go through this much suffering: ...
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How to Test a Concern in Rails

Given that I have a Personable concern in my Rails 4 application which has a full_name method, how would I go about testing this using RSpec? ...