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ORA-00979 not a group by expression
...ults to a single value (like MIN, MAX or SUM).
A simple example to understand why this happens: Imagine you have a database like this:
FOO BAR
0 A
0 B
and you run SELECT * FROM table GROUP BY foo. This means the database must return a single row as result with the first column 0 to fulfill t...
Convert list to dictionary using linq and not worrying about duplicates
...rson objects. I want to convert to a Dictionary where the key is the first and last name (concatenated) and the value is the Person object.
...
How to list containers in Docker
There's a command to list images, docker images , but there doesn't seem to be a corresponding docker containers .
14 Ans...
Junit: splitting integration test and Unit tests
...hese tests (apart from most not working) are a mixture of actual unit test and integration tests (requiring external systems, db etc).
...
What is a .snk for?
What is a .snk file for? I know it stands for Strongly Named Key , but all explanations of what it is and how it works goes over my head.
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How to input a regex in string.replace?
...racters" which need to be escaped (i.e. with a backslash placed in front - and the rules are different inside and outside character classes.) There is an excellent online tutorial at: www.regular-expressions.info. The time you spend there will pay for itself many times over. Happy regexing!
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Parse JSON in C#
...to parse some JSON data from the Google AJAX Search API. I have this URL and I'd like to break it down so that the results are displayed. I've currently written this code, but I'm pretty lost in regards of what to do next, although there are a number of examples out there with simplified JSON stri...
How to add images in select list?
...others</option>
</select>
Better yet, you can separate HTML and CSS like that
HTML
<select id="gender">
<option>male</option>
<option>female</option>
<option>others</option>
</select>
CSS
select#gender option[value="male"] ...
Google Guava vs. Apache Commons [closed]
I was looking for a bidirectional map implementation in Java, and stumbled upon these two libraries:
5 Answers
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Why JSF calls getters multiple times
... is caused by the nature of deferred expressions #{} (note that "legacy" standard expressions ${} behave exactly the same when Facelets is used instead of JSP). The deferred expression is not immediately evaluated, but created as a ValueExpression object and the getter method behind the expression i...