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Is it a good idea to index datetime field in mysql?

...ne table with 4 million records. Most of my queries use datetime clause to select data. Is it a good idea to index datetime fields in mysql database? ...
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How to Convert all strings in List to lower case using LINQ?

... So you'd want something like this: List<string> lowerCase = myList.Select(x => x.ToLower()).ToList(); share | improve this answer | follow | ...
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MySQL: Large VARCHAR vs. TEXT?

... @Pacerier another interesting example is mentioned in the comments of the selected answer, basically he had a front-end limit of 2,000 characters but the characters introduced were in a codepage that in reality used more bytes than normal letters, his database ended up needing space for 24k charact...
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How do I add a Maven dependency in Eclipse?

...ries In the window that appears, right-click on Global Repositories and select Go Into Right-click on "central (http://repo.maven.apache.org/maven2)" and select "Rebuild Index" Note that it will take a while to complete the download Once indexing is complete, Right-click on the project -> ...
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Django - limiting query results

...) In [23]: User.objects.all().order_by('-id')[:10] (0.000) SELECT "auth_user"."id", "auth_user"."username", "auth_user"."first_name", "auth_user"."last_name", "auth_user"."email", "auth_user"."password", "auth_user"."is_staff", "auth_user"."is_active", "auth_user"."is_superuser", "au...
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When should std::move be used on a function return value? [duplicate]

...e object to be copied is designated by an lvalue, overload resolution to select the constructor for the copy is first performed as if the object were designated by an rvalue. return foo; is a case of NRVO, so copy elision is permitted. foo is an lvalue. So the constructor selected for the "co...
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Determine a user's timezone

...ime-zone drop down at the top of a report), while defaulting the drop down selection to a GPS-determined time-zone when the user is on a mobile device that provides location information, and otherwise default to UTC. – Triynko Feb 10 '15 at 20:30 ...
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How can I use grep to show just filenames on Linux?

...andard: -l (The letter ell.) Write only the names of files containing selected lines to standard output. Pathnames are written once per file searched. If the standard input is searched, a pathname of (standard input) will be written, in the POSIX locale. In other locales, standard i...
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UILabel sizeToFit doesn't work with autolayout ios6

...ContentHuggingPriority and vertical ContentCompressionResistancePriority. Select and edit height constraint. And decrease height constraint priority. Enjoy. :) share | improve this answer ...
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How can I enable zoom in on UIWebView which inside the UIScrollView?

...l). On the Web View, in the Attributes Inspector: In the Web View section, select Scales Pages To Fit In the View section, select for Mode, "Top Left" In the View section at the bottom, check off User Interaction Enabled, and Multiple Touch Enabled ...