大约有 36,200 项符合查询结果（耗时：0.0400秒） [XML]
What's the difference between identifying and non-identifying relationships?
...child table with respect to States. But a row in Person is not identified by its state attribute. I.e. state is not part of the primary key of Person.
A non-identifying relationship can be optional or mandatory, which means the foreign key column allows NULL or disallows NULL, respectively.
S...
How to get a float result by dividing two integer values using T-SQL?
...f decimal places like
ROUND((1+0.0)/(2+0.0), 3)
The above SQL divides 1 by 2 and returns a float to 3 decimal places, as in it would be 0.500.
One can CAST to the following types: binary, char, date, datetime, decimal, json, nchar, signed, time, and unsigned.
...
How dangerous is it to access an array out of bounds?
... I read from outside the array (I now understand I then access memory used by some other parts of my program or even beyond that) or I am trying to set a value to an index outside of the array. The program sometimes crashes, but sometimes just runs, only giving unexpected results.
...
git - Your branch is ahead of 'origin/master' by 1 commit
...for the following commit.
The message you're seeing (your branch is ahead by 1 commit) means that your local repository has one commit that hasn't been pushed yet.
In other words: add and commit are local operations, push, pull and fetch are operations that interact with a remote.
Since there see...
What is the “FS”/“GS” register intended for?
...
There is what they were intended for, and what they are used for by Windows and Linux.
The original intention behind the segment registers was to allow a program to access many different (large) segments of memory that were intended to be independent and part of a persistent virtual store....
What are good examples of genetic algorithms/genetic programming solutions? [closed]
..."gene" part), each of which corresponded to a specific shape in the minute-by-minute price data of the S&P500 futures, as well as a specific order (buy or sell) and stop-loss and stop-profit amounts. Each string (or "gene") had its profit performance evaluated by a run through 3 years of histor...
Using IPython notebooks under version control
...already use it, I didn't find clear instructions about how to implement it by googling around. So it may be useful to other people.
Save a file with this content somewhere (for the following, let us assume ~/bin/ipynb_output_filter.py)
Make it executable (chmod +x ~/bin/ipynb_output_filter.py)
Cr...
What is the best way to stop people hacking the PHP-based highscore table of a Flash game
...ame with no upper score limit and no way to verify the score on the server by replaying moves etc.
18 Answers
...
How to find out the number of CPUs using python
...the local machine using Python. The result should be user/real as output by time(1) when called with an optimally scaling userspace-only program.
...
Generate a random point within a circle (uniformly)
...point uniformly in a triangle ABC, where |AB|=|BC|? Let's make this easier by extending to a parallelogram ABCD. It's easy to generate points uniformly in ABCD. We uniformly pick a random point X on AB and Y on BC and choose Z such that XBYZ is a parallelogram. To get a uniformly chosen point in the...