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How to drop columns using Rails migration
...changes at once.
Here's the full list of supported change_table methods:
http://apidock.com/rails/ActiveRecord/ConnectionAdapters/SchemaStatements/change_table
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How do you validate a URL with a regular expression in Python?
...f they're displeasing in some way.
Do you want the scheme to always be "http"? Do you want the netloc to always be "www.somename.somedomain"? Do you want the path to look unix-like? Or windows-like? Do you want to remove the query string? Or preserve it?
These are not RFC-specified validati...
T-SQL: Selecting rows to delete via joins
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Find index of last occurrence of a sub-string using T-SQL
Is there a straightforward way of finding the index of the last occurrence of a string using SQL? I am using SQL Server 2000 right now. I basically need the functionality that the .NET System.String.LastIndexOf method provides. A little googling revealed this - Function To Retrieve Last Index ...
Getting multiple keys of specified value of a generic Dictionary?
It's easy to get the value of a key from a .NET generic Dictionary:
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Git workflow and rebase vs merge questions
...it will erase all of your remote branches that are not on your local box.
http://twitter.com/dysinger/status/1273652486
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Why doesn't JavaScript support multithreading?
...n the extra possibilities.
For the future of JavaScript, check this out:
https://developer.mozilla.org/presentations/xtech2006/javascript/
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Why is the Windows cmd.exe limited to 80 characters wide?
... it from the disk image at the official website (freedos.org) or get it at http://www.ibiblio.org/pub/micro/pc-stuff/freedos/files/dos/mode/2005/.
New FreeDOS MODE by Eric Auer 2003-2005. License: GPL. (version 12may2005)
MODE [device] [/STA[TUS]] (show status of one or all devices...
Java: Clear the console
...\033[2J");
System.out.flush();
}
For further references visit: http://techno-terminal.blogspot.in/2014/12/clear-command-line-console-and-bold.html
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Get Insert Statement for existing row in MySQL
...he INSERT statements, then the only way that I know of is to use mysqldump http://dev.mysql.com/doc/refman/5.1/en/mysqldump.htm. You can give it options to just dump data for a specific table and even limit rows.
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