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Difference between 3NF and BCNF in simple terms (must be able to explain to an 8-year old)

...in BCNF because there is no column (either key or non-key) that is functionally dependent on anything besides that key. Because each pizza must have exactly one of each topping type, we know that (Pizza, Topping Type) is a candidate key. We also know intuitively that a given topping cannot belong ...
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No mapping found for field in order to sort on in ElasticSearch

... I still have the problem but I want the documents to be in the results in all cases even if they don't have the attribute. – c4k Oct 27 '13 at 15:47 ...
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Can you nest html forms?

... I agree with the answer, but to ask another, why not? Why does HTML not allow for nesting forms? To me, it appears to be a limitation that we would be better off without. There are many examples where using nested forms would be easier to program (i.e. using an upload photo form with a profile ed...
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How can I prevent SQL injection in PHP?

...is way it is impossible for an attacker to inject malicious SQL. You basically have two options to achieve this: Using PDO (for any supported database driver): $stmt = $pdo->prepare('SELECT * FROM employees WHERE name = :name'); $stmt->execute([ 'name' => $name ]); foreach ($stmt as $...
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JavaScript open in a new window, not tab

I have a select box that calls window.open(url) when an item is selected. Firefox will open the page in a new tab by default. However, I would like the page to open in a new window, not a new tab. ...
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Pragma in define macro

...ay of doing that. Then again, there are no portable ways to use #pragma at all. Because of this, many C/C++ compilers define their own methods for doing pragma-like things, and they often can be embedded in macros, but you need a different macro definition on every compiler. If you are willing to go...
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Which icon sizes should my Windows application's icon include?

... 24, 32, 40, 48, 64, 96, 128 and 256. Then I checked which image is shown. All these were done with normal 96dpi. If using a larger DPI, the larger sizes may be used (only checked this a bit in Windows 7). The results: Windows XP: Explorer views: Details / List: 16 Icons: 32 Tiles / Thumbnails: 48...
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sql “LIKE” equivalent in django query

...s. I have made the lookup into a Django-like-lookup application. After installing it the __like lookup with the % and _ wildcards will be enabled. All the necessary code in the application is: from django.db.models import Lookup from django.db.models.fields import Field @Field.register_lookup cl...
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Binding an enum to a WinForms combo box, and then setting it

...dView.CurrentRow.Cells["comboColumnCell"].Value. I can see value but internally it throws null pointer exception – ssal Jun 5 '14 at 17:18 ...
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Why isn't ProjectName-Prefix.pch created automatically in Xcode 6?

Why isn't ProjectName-Prefix.pch created automatically in Xcode 6 ? 8 Answers 8 ...