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What is this operator in MySQL?

...elds 1. Unlike the regular = operator, values of NULL don't have a special meaning and so it never yields NULL as a possible outcome; so: 'a' <=> NULL yields 0 and NULL <=> NULL yields 1. Usefulness This can come in useful when both operands may contain NULL and you need a consistent com...
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Why does “_” (underscore) match “-” (hyphen)?

... afaik this is only relevant when you are in a pattern context. e.g. inside a LIKE statement. When replacing all _ with an - : UPDATE sys_file set identifier = REPLACE(identifier, '_', '-') WHERE identifier LIKE '%\_%';. Notice the escaping inside LIKE and no escaping inside REPLACE. (I find it s...
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Encoding URL query parameters in Java

... But doing so can change the meaning of the URI, since the interpretation of the query string is up to the server. If you are producing a application/x-www-form-urlencoded query string, either is fine. If you are fixing up a URL that the user typed/paste...
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How can I clear or empty a StringBuilder? [duplicate]

...d seems like setLength(0) is the best, and it also seems like a very clear meaning of emptying the buffer. – Eran May 12 '12 at 22:08 20 ...
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Is there a way to keep Hudson / Jenkins configuration files in source control?

...Original Answer Have a look at my answer to a similar question. The basic idea is to use the filesystem-scm-plugin to detect changes to the xml-files. Your second part would be committing the changes to SVN. EDIT: If you find a way to determine the user for a change, let us know. EDIT 2011-01-10 ...
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Does MS SQL Server's “between” include the range boundaries?

... you have to be careful; if only a date is given the value is taken as of midnight on that day; to avoid missing times within your end date, or repeating the capture of the following day's data at midnight in multiple ranges, your end date should be 3 milliseconds before midnight on of day following...
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What is trunk, branch and tag in Subversion? [duplicate]

...bversion does not require you to have these directories nor assign special meaning to them. However, this convention is very common and, unless you have a really good reason, you should follow the convention. The book links that other readers have given describe the convention and how to use it. ...
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How to resize an image to fit in the browser window?

... contributing height, such as margin and padding on the body? vh literally means the hight of the view, so if any other elements add hight to your page, the entire page will be > 100vh. Does that make sense? – Max May 17 '17 at 4:55 ...
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Can't connect to local MySQL server through socket homebrew

...you are able to start mysql with below command; mysql server start this means; mysql is able to start manually, but it doesn't start automatically when the operating system is started. Adding mysql to services will fix this problem. To do so, you can run below command; brew services start mysql ...
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fetch in git doesn't get all branches

...rigin.fetch +refs/heads/*:refs/remotes/origin/* The wildcard * of course means everything under that path. Unfortunately I saw this comment after I had already dug through and found the answer by trial and error. share ...