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Primary key or Unique index?
At work we have a big database with unique indexes instead of primary keys and all works fine.
15 Answers
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SQL Server indexes - ascending or descending, what difference does it make?
When you create an index on a column or number of columns in MS SQL Server (I'm using version 2005), you can specify that the index on each column be either ascending or descending. I'm having a hard time understanding why this choice is even here. Using binary sort techniques, wouldn't a lookup be ...
Make git automatically remove trailing whitespace before committing
...un without error, doing
the right thing, regardless of whether the tree or index are dirty. However, they don't work if an interactive git rebase -i is already in progress; see my ~/.gitconfig for additional checks if you care about this corner case, where the git add -e trick described at the end s...
How to find index of list item in Swift?
I am trying to find an item index by searching a list . Does anybody know how to do that?
22 Answers
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Elastic search, multiple indexes vs one index and types for different data sets?
I have an application developed using the MVC pattern and I would like to index now multiple models of it, this means each model has a different data structure.
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Combining two Series into a DataFrame in pandas
...olumns (otherwise it simply numbers them):
In [1]: s1 = pd.Series([1, 2], index=['A', 'B'], name='s1')
In [2]: s2 = pd.Series([3, 4], index=['A', 'B'], name='s2')
In [3]: pd.concat([s1, s2], axis=1)
Out[3]:
s1 s2
A 1 3
B 2 4
In [4]: pd.concat([s1, s2], axis=1).reset_index()
Out[4]:
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Return positions of a regex match() in Javascript?
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exec returns an object with a index property:
var match = /bar/.exec("foobar");
if (match) {
console.log("match found at " + match.index);
}
And for multiple matches:
var re = /bar/g,
str = "foobarfoobar";
while ((match = re....
Replacing a char at a given index in string? [duplicate]
...
Use a StringBuilder:
StringBuilder sb = new StringBuilder(theString);
sb[index] = newChar;
theString = sb.ToString();
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Minimum and maximum value of z-index?
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http://www.w3.org/TR/CSS21/visuren.html#z-index
'z-index'
Value: auto | <integer> | inherit
http://www.w3.org/TR/CSS21/syndata.html#numbers
Some value types may have integer
values (denoted by <integer>) or
real number values (deno...
Why covariance and contravariance do not support value type
...numerable<int> as an IEnumerable<object>, the code using the sequence would have to know whether to perform a boxing conversion or not.
You might want to read Eric Lippert's blog post on representation and identity for more on this topic in general.
EDIT: Having reread Eric's blog pos...