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How can I read command line parameters from an R script?
...arg3
If your args are strings with spaces in them, enclose within double quotes.
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Why use multiple columns as primary keys (composite primary key)
..." link is particularly stupid, the info is self-serving and false. 2) The index on the columns that make the row unique cannot be avoided. A "surrogate" ID with an index is always an additional column and an additional index. Rather silly because it is redundant. And slower.
–...
What is a handle in C++?
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A handle can be anything from an integer index to a pointer to a resource in kernel space. The idea is that they provide an abstraction of a resource, so you don't need to know much about the resource itself to use it.
For instance, the HWND in the Win32 API is a h...
How to reset a single table in rails?
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To reset the index/primary key in SQLite just type:
$ rails console
> ActiveRecord::Base.connection.execute("DELETE from sqlite_sequence where name = 'yourtablename'")
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Is it possible to get element from HashMap by its position?
...st HashMap.
Here is an approach that will allow you to get a value by its index in the map:
public Object getElementByIndex(LinkedHashMap map,int index){
return map.get( (map.keySet().toArray())[ index ] );
}
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How do I best silence a warning about unused variables?
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This is how Q_UNUSED is implemented in principle.
– Dmitry Volosnykh
Jan 17 '12 at 11:02
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Composer killed while updating
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Unfortuantely composer requires a lot of RAM & processing power. Here are a few things that I did, which combined, made the process bearable. This was on my cloud playpen env.
You may be simply running out of RAM. Enable swap: https://www.digit...
Should I size a textarea with CSS width / height or HTML cols / rows attributes?
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I recommend to use both. Rows and cols are required and useful if the client does not support CSS. But as a designer I overwrite them to get exactly the size I wish.
The recommended way to do it is via an external stylesheet e.g.
textarea {
width: 300px;
he...
Filter git diff by type of change
...ssions to filter out extension types and certain paths from a diff file.
^Index.*\.(dll|pdb|exe|txt|zip|log|ism|resx|tlog|htm|lib)$[\s\S.]*?^Index
^Index: Shared/.+$[\s\S.]*?^Index
^Index: Next/source/Utility/.+$[\s\S.]*?^Index
Only problem is, when it reaches the end. You have to 'ctrl+home' and...
How to ALTER multiple columns at once in SQL Server
...s usually generate their scripts: create a new table and replicate FKs and indexes, etc, drop original table and then rename new table,
– KM.
Sep 8 '16 at 12:24
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