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Select n random rows from SQL Server table
I've got a SQL Server table with about 50,000 rows in it. I want to select about 5,000 of those rows at random. I've thought of a complicated way, creating a temp table with a "random number" column, copying my table into that, looping through the temp table and updating each row with RAND() , and ...
Why can I not push_back a unique_ptr into a vector?
What is wrong with this program?
2 Answers
2
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Concatenating two lists - difference between '+=' and extend()
I've seen there are actually two (maybe more) ways to concatenate lists in Python:
One way is to use the extend() method:
9...
Reading GHC Core
Core is GHC's intermediate language. Reading Core can help you better understand the performance of your program. Someone asked me for documentation or tutorials on reading Core, but I couldn't find much.
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Is there a CSS not equals selector?
Is there something like != (not equal) in CSS?
e.g, I have the following code:
6 Answers
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How can I find the latitude and longitude from address?
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public GeoPoint getLocationFromAddress(String strAddress){
Geocoder coder = new Geocoder(this);
List<Address> address;
GeoPoint p1 = null;
try {
address = coder.getFromLocationName(strAddress,5);
if (address==nu...
JavaScript before leaving the page
I want to make a confirmation before user leaving the page. If he says ok then it would redirect to new page or cancel to leave. I tried to make it with onunload
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Determine a user's timezone
... for a web server to be able to determine a user's timezone within a web page?
24 Answers
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What is the difference between const_iterator and non-const iterator in the C++ STL?
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const_iterators don't allow you to change the values that they point to, regular iterators do.
As with all things in C++, always prefer const, unless there's a good reason to use regular iterators (i.e. you want to use the fact that they're not const to change th...
Is it possible to write data to file using only JavaScript?
I want to Write Data to existing file using JavaScript.
I don't want to print it on console.
I want to Actually Write data to abc.txt .
I read many answered question but every where they are printing on console.
at some place they have given code but its not working.
So please can any one help me H...