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Can a foreign key be NULL and/or duplicate?

...at record. A separate table can be "ProposalAssignedTo" or some such, with appropriate constraints. A query writer can then join to that table, and supply their own logic for whatever we want to do when a proposal doesn't have a salesperson. NULL doesn't just mean "we don't know" - it can be used fo...
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how to make a whole row in a table clickable as a link?

...use jquery. Author's note II: Preserved for posterity but surely the wrong approach in 2020. (Was non idiomatic even back in 2017) Original Answer You are using Bootstrap which means you are using jQuery :^), so one way to do it is: <tbody> <tr class='clickable-row' data-href='url://'&g...
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Why use strong named assemblies?

...Global Assembly Cache (GAC). Thus it allows you to share it among multiple applications. Strong naming guarantees a unique name for that assembly. Thus no one else can use the same assembly name. Strong name protect the version lineage of an assembly. A strong name can ensure that no one is able to ...
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SVN (Subversion) Problem “File is scheduled for addition, but is missing” - Using Versions

...folder, is what I want the current state of this repo to be... now let it happen... don't tell me what I can and can't do with these files, but yes, keep track of it all for me."? – Mike Feb 11 '10 at 23:54 ...
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Replacing H1 text with a logo image: best method for SEO and accessibility?

... does wrapping an h1 around an image with alt text carry the same weight (seo-wise) as plain text wrapped with an h1? – Andrew Jun 18 '09 at 12:11 ...
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Maven2: Best practice for Enterprise Project (EAR file)

...</modules> <displayName>My Ear Name displayed in the App Server</displayName> <!-- If I want maven to generate the application.xml, set this to true --> <generateApplicationXml>true</generateApplicationXml> </configuration&...
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How to merge remote master to local branch

...ll --rebase instead, git will fast forward your master to upstream's, then apply your changes on top. share | improve this answer | follow | ...
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Npm install failed with “cannot run in wd”

... I have experienced the same problem when trying to publish my nodejs app in a private server running CentOs using root user. The same error is fired by "postinstall": "./node_modules/bower/bin/bower install" in my package.json file so the only solution that was working for me is to use both op...
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Should you ever use protected member variables?

...a derived class, I change it from private to protected. This hardly ever happens - I'm really not a fan at all of inheritance, as it isn't a particularly good way to model most situations. At any rate, carry on, no worries. I'd say this is fine (and probably the best way to go about it) for the ma...
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A non-blocking read on a subprocess.PIPE in Python

... I've created some friendly wrappers of this in the package shelljob pypi.python.org/pypi/shelljob – edA-qa mort-ora-y Oct 31 '13 at 10:07 ...