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MySQL get the date n days ago as a timestamp

... DATE_SUB will do part of it depending on what you want mysql> SELECT DATE_SUB(NOW(), INTERVAL 30 day); 2009-06-07 21:55:09 mysql> SELECT TIMESTAMP(DATE_SUB(NOW(), INTERVAL 30 day)); 2009-06-07 21:55:09 mysql> SELECT UNIX_TIMESTAMP(DATE_SUB(NOW(), INTERVAL 30 day)); 1244433347 ...
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How to load assemblies in PowerShell?

...me; These should also work: Add-Type -AssemblyName $TypeName -PassThru | Select-Object -ExpandProperty Assembly | Select-Object -ExpandProperty FullName -Unique If I want my script to always use a specific version of a .dll but I can't be certain of where it's installed, how do I determine what ...
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What linux shell command returns a part of a string? [duplicate]

... what do we need to do if we want to start from 3rd char till end of the string ie: "abcdef" we need cdef then echo "abcdef" | cut -c3?" – user1731553 Apr 5 '16 at 5:46 ...
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What does “abstract over” mean?

...pt formation, abstractions are formed by grouping things by some essential characteristics and omitting their specific other characteristics. The abstraction is unified under a single symbol or word denoting the similarities. We say that we abstract over the differences, but this really means we're ...
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How is Docker different from a virtual machine?

...e host, see superuser.com/questions/889472/…. However, to illustrate the union filesystem of the containers, there could be a shared layer of libs/bins directly above the docker engine. – Betamos Dec 5 '15 at 1:33 ...
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Why does the 260 character path length limit exist in Windows?

...raphs), the maximum length for a path is MAX_PATH, which is defined as 260 characters. A local path is structured in the following order: drive letter, colon, backslash, name components separated by backslashes, and a terminating null character. For example, the maximum path on drive D is "D:\some 2...
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mingw-w64 threads: posix vs win32

...API) which GCC can then link in to enable all the fancy features." So if i select the win32 model, GCC can still enable all the features, because it makes use of winpthreads? But in the bullet below, you write "win32: No C++11 multithreading features". I don't understand. Does "which GCC can then li...
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How to convert String to Long in Kotlin?

... Just a heads up, if you're iterating a string of digits, they will be chars and [char].toInt() will give you the ascii representation. – Peheje Jul 20 '17 at 17:11 add a ...
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Illegal mix of collations (utf8_unicode_ci,IMPLICIT) and (utf8_general_ci,IMPLICIT) for operation '=

...CIT) and (utf8_unicode_ci,IMPLICIT) for operation '=' $this->db->select("users.username as matric_no, CONCAT(users.surname, ' ', users.first_name, ' ', users.last_name) as fullname") ->join('users', 'users.username=classroom_students.matric_no', 'left') ...
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android studio 0.4.2: Gradle project sync failed error

...butions/gradle-1.9-all.zip After open your project in Android Studio and select the build.gradle file in the /src directory and edit it to this : dependencies { classpath 'com.android.tools.build:gradle:0.7.+' } After fixing it like this I discovered this article : http://tools.andr...