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Why is SELECT * considered harmful?
...st and weren't needed when the original consumers coded their data access.
Indexing issues. Consider a scenario where you want to tune a query to a high level of performance. If you were to use *, and it returned more columns than you actually needed, the server would often have to perform more ex...
How to remove single character from a String
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One possibility:
String result = str.substring(0, index) + str.substring(index+1);
Note that the result is a new String (as well as two intermediate String objects), because Strings in Java are immutable.
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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...
Unstaged changes left after git reset --hard
... @NLwino, git rm .gitattributes removes .gitattributes from the index. git add -A adds all (including the removal of .gitattributes) to the index, which should then only be the removal of .gitattributes, if that was really the problem. git reset --hard resets all uncommitted changes, whic...
Converting any string into camel case
...camelize(str) {
return str.replace(/(?:^\w|[A-Z]|\b\w)/g, function(word, index) {
return index === 0 ? word.toLowerCase() : word.toUpperCase();
}).replace(/\s+/g, '');
}
camelize("EquipmentClass name");
camelize("Equipment className");
camelize("equipment class name");
camelize("Equipment C...
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.
–...
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 ] );
}
share
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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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