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Difference between partition key, composite key and clustering key in Cassandra?
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In a situation of COMPOSITE primary key, the "first part" of the key is called PARTITION KEY (in this example key_part_one is the partition key) and the second part of the key is the CLUSTERING KEY (in this example key_part_two)
Please note that the both partition and clustering key can be made b...
How do you manage databases in development, test, and production?
...of good options. I wouldn't use the "restore a backup" strategy.
Script all your schema changes, and have your CI server run those scripts on the database. Have a version table to keep track of the current database version, and only execute the scripts if they are for a newer version.
Use a migr...
What is a clearfix?
...of laying out elements.)
A clearfix is a way for an element to automatically clear its child elements, so that you don't need to add additional markup. It's generally used in float layouts where elements are floated to be stacked horizontally.
The clearfix is a way to combat the zero-height cont...
What is Normalisation (or Normalization)?
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Normalization is basically to design a database schema such that duplicate and redundant data is avoided. If some piece of data is duplicated several places in the database, there is the risk that it is updated in one place but not the other, lead...
Convert Python program to C/C++ code? [closed]
...t * stuff). And it will never get quite as fast as plain C because it's usually interfacing with Python (100% or more? only for plain numerical code that doesn't interface with Python at all for the most time!). But other than that, yes, it can get you a pretty devent speedup.
–...
C# Sortable collection which allows duplicate keys
... Use this Comparer e.g. with SortedLists or SortedDictionaries, that don't allow duplicate keys
/// </summary>
/// <typeparam name="TKey"></typeparam>
public class DuplicateKeyComparer<TKey>
:
IComparer<TKey> where TKey : IComparable
{
#...
Why is address zero used for the null pointer?
...emory, because it means freeing the pointer again isn't dangerous; when I call malloc it returns a pointer with the value zero if it can't get me memory; I use if (p != 0) all the time to make sure passed pointers are valid, etc.
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Why does the 260 character path length limit exist in Windows?
... answered Dec 10 '09 at 11:45
vallivalli
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Is background-color:none valid CSS?
...nswered Jan 5 '12 at 8:42
James AllardiceJames Allardice
152k2121 gold badges309309 silver badges301301 bronze badges
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Black transparent overlay on image hover with only CSS?
...0; left:0;
background:rgba(0,0,0,0.6);
opacity: 0;
transition: all 1s;
-webkit-transition: all 1s;
}
Use an opacity of 1 when hovering over the pseudo element in order to facilitate the transition:
.image:hover:after {
opacity: 1;
}
END RESULT HERE
If you want to add text on h...