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How to concatenate strings of a string field in a PostgreSQL 'group by' query?
...in any aggregate expression; otherwise, the order is undefined. So you can now write:
SELECT company_id, string_agg(employee, ', ' ORDER BY employee)
FROM mytable
GROUP BY company_id;
Or indeed:
SELECT string_agg(actor_name, ', ' ORDER BY first_appearance)
PostgreSQL 8.4 or later:
PostgreSQL ...
Making a mocked method return an argument that was passed to it
....get(key);
}
}
return null;
}
});
We can now run our tests on this mock. For example:
String name = "room";
Room room = new Room(name);
roomService.persist(room);
assertThat(roomService.findByName(name), equalTo(room));
assertNull(roomService.findByName("none"));
...
Skip callbacks on Factory Girl and Rspec
...:user_without_callbacks) should create the user without the callbacks. I know this is just a "design" modification, but I think this can avoid to break pre existing code, and be more consistent.
– Gnagno
Jun 20 '13 at 16:21
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How to test if a string is basically an integer in quotes using Ruby
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I know a lot of people use it, and it's certainly aesthetically pleasing. To me though it's an indication that the code needs restructuring. If you're expecting an exception...it's not an exception.
– Sarah...
What's a good hex editor/viewer for the Mac? [closed]
... This is exactly why I ask candidates "teach me something I don't know about vim" in every interview. After 15 years I'm still find GOLD.
– Bruno Bronosky
Jan 6 '16 at 1:33
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How to resolve “git did not exit cleanly (exit code 128)” error on TortoiseGit? [closed]
... the unix-based systems. The guys is asking for Windows. In Ubuntu we all know it's easy as pie ...
– Деян Добромиров
Jun 27 '16 at 8:29
8
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How do I rename an open file in Emacs?
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Nice one. Now chilling in my functions.el.
– Felix D.
Jun 18 '14 at 19:32
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Understanding colors on Android (six characters)
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@TheUnwokenFool, this answer may be outdated now. I don't see anything either about setting opacity levels for text. If there appear to be any contradictions go with the current guidelines.
– Suragch
Jan 7 '19 at 23:03
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isset() and empty() - what to use
...pty just use empty as it checks whether it is set as well, if you want to know whether something is set or not use isset.
Empty checks if the variable is set and if it is it checks it for null, "", 0, etc
Isset just checks if is it set, it could be anything not null
With empty, the following thin...
Can I store images in MySQL [duplicate]
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haha, Don't just scare people. I don't know how it was in 2011 but now DBs are so improved and store blob columns separated from the normal data, you'll never notice a change of speed. there is even streamline too
– azerafati
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