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difference between primary key and unique key
...S it cannot be NULL - e.g. MySQL adds NOT NULL
Primary Key is a unique key identifier of the record
Unique Key:
Can be more than one unique key in one table
Unique key can have NULL values
It can be a candidate key
Unique key can be NULL ; multiple rows can have NULL values and therefore may not...
D Programming Language in the real world? [closed]
...ly someone else can comment who's in this space, but there too I think the idea is that performance often really matters so you want a compiled-to-the-metal language. Services are often fairly small, self-contained processes, so interop with large amounts of legacy C++ code is not really necessary ...
How to convert a negative number to positive?
... you can use
import numpy as np
np.abs(-1.23)
>> 1.23
It will provide absolute values.
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Update an outdated branch against master in a Git repo
...ner overall results to later readers, in my opinion, but that is nothing aside from personal taste.
To rebase and keep the branch you would:
git checkout <branch> && git rebase <target>
In your case, check out the old branch, then
git rebase master
to get it rebuilt agai...
Should I delete the cgi-bin folder in a subdomain I just created?
...answered Feb 23 '10 at 20:56
David PfefferDavid Pfeffer
35.1k2626 gold badges116116 silver badges195195 bronze badges
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What's the difference of strings within single or double quotes in groovy?
... var channelOptions = {
tags: "".split(" "),
id: "1"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled...
How to list all tags that contain a commit?
... commit cbc60b6 by Jean-Jacques Lafay (lanfeust69):
git tag --contains: avoid stack overflow
In large repos, the recursion implementation of contains(commit, commit_list) may result in a stack overflow. Replace the recursion with a loop to fix it.
This problem is more apparent on Windows than on Li...
Is there type Long in SQLite?
...ypes like int, integer, bigint, etc.?
and
Version of SQLite used in Android?
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Difference between CSS3 transitions' ease-in and ease-out
...eed, then finish slowly.
ease-in-out will start slowly, be fastest at the middle of the animation, then finish slowly.
ease is like ease-in-out, except it starts slightly faster than it ends.
linear uses no easing.
Finally, here's a great description of the cubic-bezier syntax, but it's usually not ...
How to allow keyboard focus of links in Firefox?
Go to this ultra-simple fiddle in a Webkit browser and click on on of the inputs:
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